Alternative definition : MMHCC: Polypoid squamous lesion without evidence of invasion or desmoplasia. Lesions
with a crateriform growth pattern on a polypoid stalk have occasionally been diagnosed
as keratoacanthoma. The pathology panel recommends avoiding the use of the diagnosis
of keratoacanthoma, as it has been applied to a variety of lesions (papillomas, well
differentiated squamous cell carcinoma with a crateriform growth pattern and certain
breast lesions).;