Regression in Thin Malignant Melanoma

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Abstract
• Forty-eight malignant melanomas of the extremities, 1 mm or less in maximal thickness, were studied to better define microscopic criteria of regression in thin melanomas. Eleven tumors (23%) exhibited definite regression in the form of one or more segmental areas (defects) where the invasive component was replaced by mononuclear cell infiltrate and fibrosis. Thirteen other tumors (27%) had diffuse, nonsegmental changes classified as probable regression. Nineteen lesions (40%) lacked regression, although 14 of these contained focal evidence of host response. Five melanomas (17% of lesions Arch Dermatol1985;121:1127-1131)