鼻入口部に生じたケラトアカントーマ例

抄録

Keratoacanthoma is a benign epithelial tumor. It most frequently arises in an area of sun-exposed skin, particularly the facial surface. It is sometimes difficult to distinguish keratoacanthomas from squamous cell carcinomas because of their similar clinical and microscopic characteristics.
We have experienced a case arising in the nostril.
The patient was a 43-year-old woman. She found a tumor in the left nostril in December 1998, but was not examined. Then she was examined at another hospital because of increasing pain in April 1999. However, a definitive diagnosis was not obtained, so she visited our hospital in May. At the first examination, we found a dark red tumor covered by crust measuring 14×16mm in the left nostril. We resected the tumor along with the crust. Histopathological tissue showed neutrophil invasion on the corium with defective epidermis and hyperkeratosis with a pseudohorn cyst. The final diagnosis was a keratoacanthoma. The resected region was well epithelized one month after surgery. Periodical follow-up continues.