Fig. 4

Histological findings. Histological examination demonstrated that a the cyst walls lined with stratified squamous keratinizing epithelium (HE, Bar = 50 μm), b surrounded by the outer layer of collagenous tissue with the absence of skin adnexa (HE, Bar = 100 μm). c Abundant keratin material was also observed (HE, Bar = 100 μm). A diagnosed of epidermoid cysts was confirmed