Table 2: MRI signal findings on epidermal cysts according to size category.

Case size
(cm)
MRI Signal Intensity of Cyst T1-WI
[n (%)]
T2-WI
[n (%)]
Large (4) - 13 13
Hypointense relative to muscle 1 (8)
Isointense relative to muscle 3 (23)
Hyperintense relative to muscle 9 (69) 9 (69)
Isointense relative to adipose 2 (15)
Hyperintense relative to adipose 2 (15)
Middle (2 to <4) - 12 12
Hypointense relative to muscle
Isointense relative to muscle 1 (8)
Hyperintense relative to muscle 11 (92) 7 (58)
Isointense relative to adipose 3 (25)
Hyperintense relative to adipose 2 (17)
Small (<2) - 8 8
Hypointense relative to muscle
Isointense relative to muscle
Hyperintense relative to muscle 8 (100) 4 (50)
Isointense relative to adipose 2 (25)
Hyperintense relative to adipose 2 (25)
Total - 33 33
(3.5) Hypointense relative to muscle 1 (3)
(range, 0.6 to 12) Isointense relative to muscle 4 (12) -
Hyperintense relative to muscle 28 (85) 20 (61)
Isointense relative to adipose 7 (21)
Hyperintense relative to adipose 6 (18)

MRI magnetic resonance imaging, WT weighted image

Back to Article