Cutaneous pseudolymphoma

The diagnosis of cutaneous lymphoreticular infiltrative lesions is difficult. There are many diagnoses possible, and oftentimes it is difficult to distinguish between a malignant lymphoma cutis and any of the many benign lymphomas. This article deals with a patient who was diagnosed as having metastatic small-cell carcinoma. Because of the inconsistency between the pathologic diagnosis of malignancy and the benign clinical findings and course, a wide ablative excision of the lesion was done and the surgical specimen was studied thoroughly by numerous pathologists. Even then the diagnosis could not be clearly established. The differential diagnosis of cutaneous lymphomatoses is discussed.