Melanoma in situ and syringoma: a rare collision tumor. Clinical-pathological report of a case

Abstract

Collision or contiguous tumors, defined as two or more distinct tumors occurring at one site, are often an unexpected finding and may represent a diagnostic challenge, as clinical and histological presentations do not always coincide. Various combinations of collision tumors have been described with respect to melanocytic lesions, with the most frequently reported being the combination of nevus and basal cell carcinoma. We present an unusual case on the nose involving a melanoma in situ and a clinically-inapparent syringoma, which, to the best of our knowledge, is the first report of this combination.

Four-Cell Population Collision Tumor of the Scalp: A Case Report and Review of Literature

“…Eight malignant skin tumor cases, located primarily on the scalp, were identified as CTum containing MM and another malignant cell type. [8][9][10][11][12][13][14] As noted above, surgical excision of the tumor appears to be the treatment for most of the observed HNCTum. Chemotherapy and autologous stem cell transplant was another treatment option for a lesion on the posterior neck.…”