Keratoacanthoma is characterized by:
Lesions may exhibit pseudocarcinomatous features with nests of epithelial cells breaking away from the main body of the tumour. These may be difficult to differentiate from squamous cell carcinoma. Features suggesting keratoacanthoma include:
Nevertheless, examination of a small area of biopsy may lead a histopathologist to an incorrect diagnosis of malignancy; it is prudent to relay the clinical suspicion of a keratocanthoma.
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