Fig. 4.

Pathological findings and postoperative scar. a Appearance of the resected tumor. As the tumor ruptured during surgery and almost all of the content was liquid, the resected lesion shrank; otherwise, it would have been extirpated en bloc. b Microscopic findings of the tumor in a low-power field. Two specimens are presented with a hematoxylin–eosin stain (HE stain). The inset with blue lines in the lower specimen is shown in c. c Microscopic findings of the tumor in a high-power field. The lumen of the tumor is covered with stratified cells with hair follicles (blue arrowhead). Many sebaceous glands are observed just below the stratified cells (red arrowheads). There are some daughter lesions in this specimen (black arrows). The scale bar is 100 μm. d Operative scar 1 year after surgery. The scar is inconspicuous as it is located just behind the hairline. The patient was aware and accepted that a scar would be left as a result of the surgery