A Case of an Undiagnosable Tumor of the External Auditory Canal. Differential Diagnosis for Keratoacanthoma, Verrucous Carcinoma, and Squamous Cell Carcinoma.:DIFFERENTIAL DIAGNOSIS FOR KERATOACANTHOMA, VERRUCOUS CARCINOMA, AND SQUAMOUS CELL CARCINOMA
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We recently encountered a patient with a well-differentiated squamous cell carcinoma (SCC) appearing as a primary tumor of the external auditory canal. The tumor was fatal, although repeated histopathological testing performed during the course of the disease failed to yield a diagnosis of malignancy. We suspect that the tumor may have been a keratoacanthoma, but the tumor also resembled the tumors in reported cases of verrucous carcinoma.<BR>Differential diagnoses for SCC, keratoacanthoma and verrucous carcinoma are extremely difficult. Accordingly, the final diagnoses in these cases are sometimes inaccurate. In cases where a definitive diagnosis is difficult or impossible, and the patient presents pathological findings or a clinical course suggestive of keratoacanthoma or verrucous carcinoma, curative therapy should be instituted immediately.
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