THE DILATED PORE, A TRICHOEPITHELIOMA

[摘要] The dilated pore is a secondary or acquired trichoepithelioma. Its predominant location is not necessarily the nasolabial or nasofacial folds. The distribution of 13 lesions on 10 patients was 5 on the upper lip, 5 on the cheek, 1 in the angle between the upper lip and the cheek, 1 on the temple and 1 on the nose. Males predominated over females 9 to 1. Unless one is aware of the clinical history and picture, the his-tologic section may be misleading because of the oblique course of the pore or by oblique sectioning missing the central cavity and thereby failing to demonstrate the true relationship of the proliferating epidermis to the follicle. This tangential sectioning has at times led to a diagnosis of seborrheic keratosis, cylindroma, epithelioma adenoides cysticum, basal cell carcinoma and even intermediate cell carcinoma. It is quite evident from the histopathology that no superficial measure such as superficial desiccation, cauterization, coagulation or abrasion can eradicate this lesion because of its extreme depth.