Subungual keratoacanthoma. Case report

Distal digital keratoacanthoma: two cases with a review of the literature

BACKGROUND

Distal digital keratoacanthoma (DKA) is an uncommon tumor difficult to diagnose clinically, and even histologically, with certainty.

OBJECTIVE

Our purpose is to report on two new cases and to discuss the clinical, histologic, and differential diagnosis.

METHODS

We have reviewed all well documented cases published in the literature.

RESULTS

No single diagnostic criterion is sufficiently sensitive and specific to be pathognomonic.

CONCLUSION

The diagnosis of DKA should be based on the correlation of clinical, radiological and pathologic findings, but the tumor is frequently diagnosed histologically as "squamous cell carcinoma, keratoacanthoma type" or as keratocarcinoma.

Subungual keratoacanthoma--a report of four cases and review of the literature

Subungual keratoacanthoma is a rare benign neoplasm which most commonly occurs in middle-aged Caucasians. It usually presents as a painful, rapidly growing lesion of the terminal phalanx. Radiography consistently demonstrates a well-defined cup-shaped erosion of the underlying bone. Clinically, subungual keratoacanthoma must be distinguished from subungual squamous carcinoma. We report four further cases and discuss the literature.