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January 1970

Tumor of the Ear Canal: Seborrheic Keratosis

Author Affiliations

From the Departments of Otolaryngology, Jefferson Medical College Hospital, Philadelphia.

Arch Otolaryngol. 1970;91(1):80-81. doi:10.1001/archotol.1970.00770040106016

SEBORRHEIC keratosis is a common, benign skin tumor. The lesion is a pigmented epithelial growth which usually appears in later life. It appears primarily on the body and arms and to a lesser extent on the face and neck. Also referred to as a benign epithelioma and basal cell papilloma, the seborrheic keratosis has no relation to the seborrheic state or sebaceous glands. The growth begins as a light yellow area which increases in size and becomes more deeply pigmented usually turning brown. It is not indurated and may be covered with a thin, greasy scale, which can be rubbed off. A patient may possess one to two lesions or hundreds.

The main histologic types are the solid, acanthotic, and verrucous types.1 All gradations and transitions occur between these two types. Microscopic examination reveals that the tumor protrudes above the horizontal place of the skin and rests on the

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