PMC4901019_01
61-year-old male with large left gluteal epidermal inclusion cyst. Sagittal STIR MR image of the proximal left thigh (A) and axial STIR MR image of the bilateral proximal thighs (B) show a large, exophytic, well-defined cystic sof- tissue mass of high signal intensity in the subcutaneous left gluteal region, with several small peripheral incomplete septa (arrows). C. The lesion shows intermediate decreased signal intensity on the axial T1W MR image of the bilateral proximal thighs (arrows).
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The images revealed a large, exophytic, well-defined cystic mass in the left inferior gluteal subcutaneous soft tissue; it demonstrated relatively homogeneous high signal intensity on the fluid-sensitive sequences and intermediate decreased signal on the T1W images, with several small incomplete marginal septa (Fig. 1). The lesion measured 17.8 cm transverse, 13.8 cm craniocaudal, and 5.8 cm anteroposterior. The lack of contrast-enhanced sequences precluded further imaging characterization of the lesion.
61-year-old male with large left gluteal epidermal inclusion cyst. Representative hematoxalin- and eosin-stained histopathology slide showing the cyst wall lined by stratified squamous epithelium with a granular cell layer (arrow). The central portion of the cyst is filled with keratinaceous debris (star).
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These findings are diagnostic of an epidermal inclusion cyst (Fig. 2).