Table 2: Mnemonic for Musculoskeletal Lesions with Fluid-Fluid Levels on MRI.

G Giant cell tumors
O Osteoblastoma
A Aneurysmal bone cyst
T Telangiectactic osteosarcoma
S Sarcomas (esp. synovial)
C Chondroblastoma
S Simple bone cyst and synovial hemangioma
F Fibroxanthoma (non-ossifying fibroma)

Bell DJ, Chen T. Fluid-fluid level containing musculoskeletal lesions (mnemonic). https://radiopaedia.org/articles/fluid-fluid-level-containing-bone-lesions-mnemonic?lang=us