Epidermal inclusion cyst: thigh
Left posterior thigh swelling for 7 years. Increasing size and local pain for a few months.
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There is a well-defined ovoid lesion in the region of interest, measuring approximately 75 x 60 x 45 mm. It is in the subcutaneous plane, abutting the deep aspect of skin. The lesion is separate from bone and muscle.
Lesion is hypoechoic to underlying muscle. It shows heterogeneous echopattern with internal subcentimeter sized hypo- and hyperechoic linear foci. There is no calcification/cystic change. It is not significantly compressible. There is no internal vascularity. There posterior acoustic enhancement.
A long standing subcutaneous thigh lesion shows characteristic ultrasound features of an epidermal inclusion cyst.
Surgical excision was performed. According to the operative surgeon, gross appearances were suggestive of epidermal inclusion cyst. Hence, histopathology was not performed.
- Epidermal Cysts in the Superficial Soft Tissue Sonographic Features With an Emphasis on the Pseudotestis Pattern Chung-Cheng Huang and others. J Ultrasound Med 2011; 30:11–17