Figure 7b. Epidermoid cyst in a 30-year-old woman. (a) Photomicrograph (original magnification, x100; H-E stain) shows fibrous tissue lined by stratified squamous epithelium that contains keratinous materials. (b) Contrast-enhanced CT scan shows a well-defined hypoattenuating mass in the pelvic retroperitoneum (thick arrow). The rectum is anteriorly displaced (thin arrow).