A large subcutaneous mass was noted in the buttock of a 79-year-old man. Computed tomography (CT) and magnetic resonance imaging (MRI) showed a thinwalled cystic mass that involved the ischiorectal fossa. The content appeared hyperintense on T1-weighted images. T2-weighted images demonstrated a considerable amount of debris. At surgery an epidermal cyst with markedly keratinized squamous epithelium was found. It contained much keratin and cholesterin.
- Epidermal cyst
- Ischio-rectal fossa
- Magnetic resonance imaging
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging