A Case of Pedunculated Trichofolliculoma Showing Various Histopathological Features

Abstract

A 49-year-old man complained of a pedunculated tumor on his right lower eyelid that had been slowly enlarging for 7 years. The tumor had a size of 25 mm×20 mm. Histopathological findings revealed that the tumor was cord-like with many horn cysts in the dermis. The largest horn cyst contained vellus hairs, and secondary hair follicles radiated from the wall of the cyst. We diagnosed this tumor histopathologically as a trichofolliculoma. Furthermore, neutrophils were observed near the cyst which we considered the primary hair follicles. Significant vascular hyperplasia, dilatation of vessels, and red blood cells were observed in the stroma of the lesion. In these types of tumors,the pedunculated shape is extremely rare. His frequent touching of the tumor caused it to become pedinculated and it increased in size due to the addition of venous stasis and bacterial infection. Skin Research, 21 : 231-234, 2022