This sebaceous cyst was huge, at almost 7 x 5 cms. and located on the buttock of this elderly male patient. The ultrasound image shows a typical hypoechoic, solid, mildly inhomogenous appearance. The patient presented with complaints related to the prostate, ignoring this large epidermoid cyst.
Color Doppler image of the same cyst shows no vascularity within the mass. A sebaceous cyst contains oily, gel like semisolid material that has been unable to escape. If infected, this can turn into an abscess.
See:
http://www.ultrasound-images.com/musculoskeletal.htm
for more ultrasound images and description of sebaceous cysts.
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