The Open Dentistry Journal




ISSN: 1874-2106 ― Volume 12, 2018
REVIEW ARTICLE

Is Conservative Surgery the Best Approach for Peripheral Calcifying Epithelial Odontogenic Tumors?



Isadora Luana Flores1, *, Tissiana Rachel Rossi Schneider2, Ana Carolina Uchoa Vasconcelos2, Sandra Beatriz Chaves Tarquinio2, Ricardo Alves de Mesquita3, Ana Paula Neutzling Gomes2
1 Department of Conservative Dentistry, Oral Pathology, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos 2492, Santa Cecília, Porto Alegre, RS, Brazil
2 Pelotas Dental School, Semiology and Clinic, Federal University of Pelotas, Rua Gonçalves Chaves, 457, Bairro Centro, Pelotas, RS, Brazil
3 Department of Oral Pathology and Surgery, Federal University of Minas Gerais, Belo Horizonte, Rua Prof Moacir Gomes de Freitas, 688, Bairro Pampulha, Belo Horizonte, MG, Brazil

Abstract

Background:

Peripheral Calcifying Epithelial Odontogenic Tumors (CEOT) rich in clear cells are a rare entity in the oral cavity, with only 14 previous case reports in the English literature. None have discussed recommended treatment approaches for extraosseous CEOT.

Objective:

This brief descriptive review describes a treatment approach for peripheral CEOT including the clear cell variant.

Study design:

A complete review of all well-documented extraosseous case reports with an emphasis on the treatment was performed. Additionally, the present article reports a case of a 21-year-old woman with an asymptomatic swelling in the gingiva finally diagnosed as peripheral CEOT abundant in clear cells.

Results:

Twenty-four cases of peripheral CEOT were described; conservative surgery was the first treatment approach in approximately 80% of cases, with only one recurrence.

Discussion:

Clear cell finding was not associated with more aggressive behavior.

Conclusion:

Conservative surgery may be an advantageous approach for this group of peripheral lesions with or without clear cells, with a recurrence rate of approximately 4%.

Keywords: Calcifying epithelial odontogenic tumor, Clear cell, Peripheral, Oral diagnosis, Surgery, Treatment.


Article Information


Identifiers and Pagination:

Year: 2018
Volume: 12
First Page: 856
Last Page: 863
Publisher Id: TODENTJ-12-856
DOI: 10.2174/1874210601812010856

Article History:

Received Date: 24/5/2018
Revision Received Date: 16/9/2018
Acceptance Date: 5/10/2018
Electronic publication date: 25/10/2018
Collection year: 2018

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© 2018 Flores et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address Correspondence to this author at the Department of Conservative Dentistry, Oral Pathology, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos 2492, Bairro Santa Cecília, Porto Alegre, RS, Brazil. Zip Code: 90035-004; Tel: +55 51 3308 5011; E-mail: isadoraluanaflores@gmail.com




1. INTRODUCTION

Calcifying Epithelial Odontogenic Tumor (CEOT) is an uncommon jaw lesion with a benign and slow-growing pattern but locally aggressive course [1Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830] ]. The lesions are most prevalent among patients aged 30 to 50 years, and no sex predilection has been observed [1Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830] , 2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] ]. Clinically, the CEOT appears as a slowly asymptomatic expansion with radiolucent honeycomb appearance in the posterior areas of the mandible [2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] ]. The CEOT is predominantly an intraosseous tumor in approximately 94% of cases [3Philipsen HP, Reichart PA. Calcifying epithelial odontogenic tumour: Biological profile based on 181 cases from the literature. Oral Oncol 2000; 36(1): 17-26.[http://dx.doi.org/10.1016/S1368-8375(99)00061-5] [PMID: 10889914] ]. The peripheral variant is a rare tumor (6%) with less aggressive behavior that was described by Pindborg in 1966 [4Pindborg JJ. The calcifying epithelial odontogenic tumor. Review of literature and report of an extra-osseous case. Acta Odontol Scand 1966; 24: 419-30.[http://dx.doi.org/10.3109/00016356609028230] ]. The classical histopathological aspects include sheets and islands of eosinophilic polyhedral epithelial cells in association with homogeneous pink amyloid-like deposits and areas of calcification [5Mesquita RA, Lotufo MA, Sugaya NN, De Araújo NS, De Araújo VC. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Report of a case and immunohistochemical investigation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003; 95(2): 198-204.[http://dx.doi.org/10.1067/moe.2003.63] [PMID: 12582361] -22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] ]. One unusual histological finding is the presence of clear cells, as reported in 14 cases of peripheral CEOT in the English literature [2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] , 5Mesquita RA, Lotufo MA, Sugaya NN, De Araújo NS, De Araújo VC. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Report of a case and immunohistochemical investigation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003; 95(2): 198-204.[http://dx.doi.org/10.1067/moe.2003.63] [PMID: 12582361] -19Habibi A, Saghravanian N, Zare R, Jafarzadeh H. Clear cell variant of extraosseous calcifying epithelial odontogenic tumor: A case report. J Oral Sci 2009; 51(3): 485-8.[http://dx.doi.org/10.2334/josnusd.51.485] [PMID: 19776521] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] , 23Bajpai M. Peripheral variant of calcifying epithelial odontogenic tumor with clear cell changes: An enigma. Indian J Pathol Microbiol 2018; 61(2): 290-1.[http://dx.doi.org/10.4103/IJPM.IJPM_679_17] [PMID: 29676382] ].

CEOT is an odontogenic tumor; the consensus regarding the best therapeutic approach is surgical excision with safe margins recommended for the intraosseous variant [3Philipsen HP, Reichart PA. Calcifying epithelial odontogenic tumour: Biological profile based on 181 cases from the literature. Oral Oncol 2000; 36(1): 17-26.[http://dx.doi.org/10.1016/S1368-8375(99)00061-5] [PMID: 10889914] , 4Pindborg JJ. The calcifying epithelial odontogenic tumor. Review of literature and report of an extra-osseous case. Acta Odontol Scand 1966; 24: 419-30.[http://dx.doi.org/10.3109/00016356609028230] ]. However, the peripheral lesions are commonly treated through conservative surgery with no review of this approach [3Philipsen HP, Reichart PA. Calcifying epithelial odontogenic tumour: Biological profile based on 181 cases from the literature. Oral Oncol 2000; 36(1): 17-26.[http://dx.doi.org/10.1016/S1368-8375(99)00061-5] [PMID: 10889914] ]. The present study reports a case of a 21-year-old Caucasian female patient with a mandibular peripheral CEOT rich in clear cells. An additional critical literature review focuses on the treatment protocols for the peripheral variant of the tumor.

2. CASE DESCRIPTION AND RESULTS

A 21-years-old Caucasian woman presented to a private dental clinic with a chief complaint of asymptomatic swelling in the gingiva observed four years prior. A gradual increase in size and no history of previous treatment were also reported during the anamnesis. The patient signed the informed consent, which represents the ethical approval of the faculty committee. Her medical and socio-economic histories were not contributory. The extra-oral evaluation did not reveal changes. The intraoral examination revealed a sessile nodule with a color similar to that of the mucosa and a focal erythematous area with a fibro-elastic consistency measuring 1.5 cm in the largest diameter extending from the inferior right lateral incisor to the inferior right first premolar. The lesion involved the vestibular and lingual gingiva, causing displacement of the inferior right canine (Fig. 1).

Fig. (1A and B)
Well-defined nodule with focal erythematous area in vestibular and lingual gingiva between the mandibular right lateral incisor and the right canine.


Panoramic reconstruction and parasagittal slices of the Cone Beam Computed Tomography (CBCT) showed a slightly superficial hypodense area between the inferior right lateral incisor and inferior right canine with reabsorption of the alveolar crest (Fig. 2). Based on the clinical and immunological aspects, the main diagnosis hypotheses included peripheral ossifying fibroma, peripheral giant cell lesion, and ancient pyogenic granuloma. The peripheral odontogenic tumors were also included as a differential diagnosis. An excisional biopsy was performed and a clear separation was noted between the lesion and mandible bone during the trans-surgical approach. The histopathological analysis revealed a well-circumscribed proliferation comprising numerous islands and strands of epithelial polyhedral cells with well-defined borders and marked round nucleus in the connective tissue under the mucosal epithelium. Numerous nests, cords, and small islands of polyhedral cells with clear and vacuolated abundant cytoplasm were observed interspersed with the amorphous eosinophilic deposits (Fig. 3). Immunohistochemistry was performed, which yielded positive results for CK-19 in the epithelial cells, except for the clear cells. Congo red staining showed the presence of amyloid-like deposits with apple-green birefringence under polarized light (Fig. 4). A final diagnosis of a peripheral CEOT rich in clear cells was reached. No complications were observed in the postoperative appointment and a follow-up schedule was established. The patient has had no recurrence after 22 months (Fig. 5).

Fig. (2)
The panoramic reconstruction of Cone Beam Computed Tomography (CBCT) showed a radiolucent area between the inferior right lateral incisor and the inferior right canine. Note the displacement of the 43 tooth. Parasagittal slices of CBCT confirmed the soft tissue origin with clear overlap of lesion on the alveolar bone. The yellow arrow in 85 and 87 slices indicating the peripheral CEOT. Reabsorption of the alveolar crest is observed in 88 to 92 and highlighted on 90 and 92 slices (yellow arrow).


Fig. (3)
A – Low power magnification showed nests and cords of odontogenic epithelial cells in the dense fibrous connective tissue under the mucosal epithelium (H&E, 50X original magnification). B. Varied size of epithelial islands composed by polyhedral cells with the presence of clear cells are also observed (H&E, 400X original magnification). C. Note the marked eosinophilic deposit interspersing the clear cell component (H&E, 400X original magnification).


Fig. (4)
A – Immunohistochemistry for CK19 showed positive labelling for odontogenic epithelium except to clear cells component (400X original magnification). Congo-Red positivity (B- 50X original magnification) and apple-green birefringence under the polarized light for amyloid-like deposits (C- 50X original magnification).


Fig. (5)
Panoramic reconstruction and parasagittal slices of CBCT showed no signs of lesion and bone neoformation is reached after 15 months of conservative approach.


3. PERIPHERAL CEOT CASES

Long-term follow-up of the central variant of CEOT has shown the best results, with no recurrence following block resection with safe margins; however, well-documented cases are scarce [1Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830] , 24Rydin K, Sjöström M, Warfvinge G. Clear cell variant of intraosseous calcifying epithelial odontogenic tumor: A case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 122(4): e125-30.[http://dx.doi.org/10.1016/j.oooo.2016.01.001] [PMID: 26953043] ]. Additionally, there is discussion regarding aggressive behavior involving clear cells in the CEOT [1Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830] , 21Rangel AL, da Silva AA, Ito FA, Lopes MA, de Almeida OP, Vargas PA. Clear cell variant of calcifying epithelial odontogenic tumor: Is it locally aggressive? J Oral Maxillofac Surg 2009; 67(1): 207-11.[http://dx.doi.org/10.1016/j.joms.2007.11.029] [PMID: 19070770] , 24Rydin K, Sjöström M, Warfvinge G. Clear cell variant of intraosseous calcifying epithelial odontogenic tumor: A case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 122(4): e125-30.[http://dx.doi.org/10.1016/j.oooo.2016.01.001] [PMID: 26953043] ]. Other odontogenic lesions with clear cells including ameloblastoma and clear cell odontogenic tumors have been reclassified as malignant, in which a more aggressive course can be expected [24Rydin K, Sjöström M, Warfvinge G. Clear cell variant of intraosseous calcifying epithelial odontogenic tumor: A case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 122(4): e125-30.[http://dx.doi.org/10.1016/j.oooo.2016.01.001] [PMID: 26953043] , 25Chrcanovic BR, Gomez RS. Calcifying epithelial odontogenic tumor: An updated analysis of 339 cases reported in the literature. J Craniomaxillofac Surg 2017; 45(8): 1117-23.[http://dx.doi.org/10.1016/j.jcms.2017.05.007] [PMID: 28601296] ]. Nonetheless, this premise has not been confirmed for CEOT because the latest review of all central variants showed no conclusive data regarding the worse course for this type of lesion [1Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830] , 24Rydin K, Sjöström M, Warfvinge G. Clear cell variant of intraosseous calcifying epithelial odontogenic tumor: A case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 122(4): e125-30.[http://dx.doi.org/10.1016/j.oooo.2016.01.001] [PMID: 26953043] , 25Chrcanovic BR, Gomez RS. Calcifying epithelial odontogenic tumor: An updated analysis of 339 cases reported in the literature. J Craniomaxillofac Surg 2017; 45(8): 1117-23.[http://dx.doi.org/10.1016/j.jcms.2017.05.007] [PMID: 28601296] ].

Peripheral CEOT is considered a harmless lesion, but the recommended approach for peripheral cases in the presence or lack of clear cells is not emphasized in previous reports [2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] , 4Pindborg JJ. The calcifying epithelial odontogenic tumor. Review of literature and report of an extra-osseous case. Acta Odontol Scand 1966; 24: 419-30.[http://dx.doi.org/10.3109/00016356609028230] -6Afrogheh A, Schneider J, Mohamed N, Hille J. Calcifying epithelial odontogenic tumour with clear langerhans cells: A novel variant, report of a case and review of the literature. Head Neck Pathol 2014; 8(2): 214-9.[http://dx.doi.org/10.1007/s12105-013-0490-8] [PMID: 24037599] , 8Orsini G, Favia G, Piattelli A. Peripheral clear cell calcifying epithelial odontogenic tumor. Report of a case. J Periodontol 2000; 71(7): 1177-80.[http://dx.doi.org/10.1902/jop.2000.71.7.1177] [PMID: 10960027] -20Marino R, Berrone M, Nesti M, Pentenero M, Gandolfo S. Maxillary peripheral calcifying epithelial odontogenic tumour (Pindborg tumor). Ann Stomatol (Roma) 2013; 4(Suppl. 2): 27.[PMID: 24353794] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] ]. In this context, a search of the English literature was performed in the PubMed database using the keywords “calcifying epithelial odontogenic tumor” with “Pindborg,” “peripheral,” “clear cell,” and “treatment.” All manuscripts on peripheral CEOT published until May 2018 were considered. Cross-references were included. Studies involving mixed odontogenic tumors in association with CEOT, CEOT associated with other conditions, no exclusive extraosseous tumors, absence of treatment modality, and no full-text database were excluded. The anatomic sites, duration, clinical and imaging aspects, types of treatment, recurrence, and follow-up are summarized in Table 1.

Table 1
Previous articles about peripheral calcifying epithelial odontogenic tumor including clear cell variant with emphasis in the treatment.


4. DISCUSSION

The peripheral variant is a rare presentation of CEOT, with a differential diagnosis including gingival reactive lesions such as ancient pyogenic granuloma, peripheral giant cell lesion, and peripheral ossifying fibroma in addition to other peripheral odontogenic tumors. The histopathological aspects of the extraosseous are similar to those of the intraosseous CEOT counterparts and Congo red staining confirms the presence of amyloid-like material such as immunohistochemistry keratin markers confirm the odontogenic epithelial origin [21Rangel AL, da Silva AA, Ito FA, Lopes MA, de Almeida OP, Vargas PA. Clear cell variant of calcifying epithelial odontogenic tumor: Is it locally aggressive? J Oral Maxillofac Surg 2009; 67(1): 207-11.[http://dx.doi.org/10.1016/j.joms.2007.11.029] [PMID: 19070770] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] ]. In addition, clear cells have been observed in some odontogenic lesions and, although previous authors have speculated their relationship with more aggressive CEOT, no role has yet been shown for the relationship between the behavior and this histopathological presentation [21Rangel AL, da Silva AA, Ito FA, Lopes MA, de Almeida OP, Vargas PA. Clear cell variant of calcifying epithelial odontogenic tumor: Is it locally aggressive? J Oral Maxillofac Surg 2009; 67(1): 207-11.[http://dx.doi.org/10.1016/j.joms.2007.11.029] [PMID: 19070770] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] ]. Extraosseous CEOT is considered a less aggressive tumor and conservative surgery is performed in most cases. However, no previous articles have evaluated the best approach for peripheral CEOT based on recurrence and follow-up data. The current review identified no clinical significance in relation to the aggressive aspects. This finding is supported by the observation that approximately 80% of cases were treated with conservative management, with only one recurrent case without a clear cell component [2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] , 4Pindborg JJ. The calcifying epithelial odontogenic tumor. Review of literature and report of an extra-osseous case. Acta Odontol Scand 1966; 24: 419-30.[http://dx.doi.org/10.3109/00016356609028230] -6Afrogheh A, Schneider J, Mohamed N, Hille J. Calcifying epithelial odontogenic tumour with clear langerhans cells: A novel variant, report of a case and review of the literature. Head Neck Pathol 2014; 8(2): 214-9.[http://dx.doi.org/10.1007/s12105-013-0490-8] [PMID: 24037599] , 8Orsini G, Favia G, Piattelli A. Peripheral clear cell calcifying epithelial odontogenic tumor. Report of a case. J Periodontol 2000; 71(7): 1177-80.[http://dx.doi.org/10.1902/jop.2000.71.7.1177] [PMID: 10960027] -18Abrahão AC, Camisasca DR, Bonelli BR, et al. Recurrent bilateral gingival peripheral calcifying epithelial odontogenic tumor (Pindborg tumor): A case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 108(3): e66-71.[http://dx.doi.org/10.1016/j.tripleo.2009.04.037] [PMID: 19716494] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] ]. A detailed evaluation of all articles on peripheral CEOT found no reported recurrence during follow-up in 96% of cases [2de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927] , 5Mesquita RA, Lotufo MA, Sugaya NN, De Araújo NS, De Araújo VC. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Report of a case and immunohistochemical investigation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003; 95(2): 198-204.[http://dx.doi.org/10.1067/moe.2003.63] [PMID: 12582361] , 6Afrogheh A, Schneider J, Mohamed N, Hille J. Calcifying epithelial odontogenic tumour with clear langerhans cells: A novel variant, report of a case and review of the literature. Head Neck Pathol 2014; 8(2): 214-9.[http://dx.doi.org/10.1007/s12105-013-0490-8] [PMID: 24037599] , 8Orsini G, Favia G, Piattelli A. Peripheral clear cell calcifying epithelial odontogenic tumor. Report of a case. J Periodontol 2000; 71(7): 1177-80.[http://dx.doi.org/10.1902/jop.2000.71.7.1177] [PMID: 10960027] -20Marino R, Berrone M, Nesti M, Pentenero M, Gandolfo S. Maxillary peripheral calcifying epithelial odontogenic tumour (Pindborg tumor). Ann Stomatol (Roma) 2013; 4(Suppl. 2): 27.[PMID: 24353794] , 22Shetty SJ, Pereira T, Desai RS. Peripheral clear cell variant of calcifying epithelial odontogenic tumor: Case report and review of the literature. Head Neck Pathol 2016; 10(4): 481-5.[http://dx.doi.org/10.1007/s12105-016-0726-5] [PMID: 27154023] , 23Bajpai M. Peripheral variant of calcifying epithelial odontogenic tumor with clear cell changes: An enigma. Indian J Pathol Microbiol 2018; 61(2): 290-1.[http://dx.doi.org/10.4103/IJPM.IJPM_679_17] [PMID: 29676382] , 26de Carvalho DL, do Canto AM, Eduardo FP, Bezinelli LM, Costa AL, Braz-Silva PH. Peripheral calcifying epithelial odontogenic tumour mimicking a gingival inflammation: A diagnostic dilemma. Case Rep Dent 2016; 2016: 3014892.[http://dx.doi.org/10.1155/2016/3014892] [PMID: 27807486] ].

A conservative soft tissue excision was the main approach in the literature and was also sufficient for the complete resolution of the current case. These findings suggest an indolent, local, non-infiltrative course of peripheral lesions when compared to intraosseous CEOT. The discrete cupping or erosion of superficial bone may be caused by compression rather than by invasive behavior, supporting the non-aggressive behavior of the lesion. Other peripheral odontogenic tumors, including ameloblastoma, ameloblastic fibroma, calcifying cystic odontogenic tumor, and adenomatoid odontogenic tumor, present similar characteristics [27Ide F, Mishima K, Saito I, Kusama K. Rare peripheral odontogenic tumors: report of 5 cases and comprehensive review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 106(4): e22-8.[http://dx.doi.org/10.1016/j.tripleo.2008.05.064] [PMID: 18718792] , 28Flores IL, Torriani MA, Damé JA, et al. Asymptomatic gingival nodule in the anterior maxilla. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 121(2): 115-8.[http://dx.doi.org/10.1016/j.oooo.2015.07.034] [PMID: 26422589] ]. An isolated case with recurrence was observed with posterior intraosseous involvement; however, it was a unique case with bilateral peripheral lesions [18Abrahão AC, Camisasca DR, Bonelli BR, et al. Recurrent bilateral gingival peripheral calcifying epithelial odontogenic tumor (Pindborg tumor): A case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 108(3): e66-71.[http://dx.doi.org/10.1016/j.tripleo.2009.04.037] [PMID: 19716494] ]. Clear cells were also not observed and there was no recurrence after the second conservative surgery [18Abrahão AC, Camisasca DR, Bonelli BR, et al. Recurrent bilateral gingival peripheral calcifying epithelial odontogenic tumor (Pindborg tumor): A case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 108(3): e66-71.[http://dx.doi.org/10.1016/j.tripleo.2009.04.037] [PMID: 19716494] ].

CONCLUSION

Our review confirms that conservative enucleation is the most appropriate management for peripheral CEOT. Moreover, we identified no association between clear cells and clinical aggressiveness in peripheral lesions as was previously suggested for the central counterparty.

CONSENT FOR PUBLICATION

Informed consent was obtained from all the patients prior to being enrolled in the study.

CONFLICT OF INTEREST

The authors declare no conflict of interest, financial or otherwise.

ACKNOWLEDGEMENTS

Declared none.

REFERENCES

[1] Turatti E, Brasil J, de Andrade BA, Romañach MJ, de Almeida OP. Clear cell variant of calcifying epithelial odontogenic tumor: Case report with immunohistochemical findings. J Clin Exp Dent 2015; 7(1): e163-6.[http://dx.doi.org/10.4317/jced.51995] [PMID: 25810830]
[2] de Oliveira MG, Chaves AC, Visioli F, et al. Peripheral clear cell variant of calcifying epithelial odontogenic tumor affecting 2 sites: Report of a case. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009; 107(3): 407-11.[http://dx.doi.org/10.1016/j.tripleo.2008.11.004] [PMID: 19157927]
[3] Philipsen HP, Reichart PA. Calcifying epithelial odontogenic tumour: Biological profile based on 181 cases from the literature. Oral Oncol 2000; 36(1): 17-26.[http://dx.doi.org/10.1016/S1368-8375(99)00061-5] [PMID: 10889914]
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