title: An uncommon malignant cutaneous squamomelanocytic tumor.
abstract: The intermingling of two malignant neoplasms within the same cutaneous tumor is rare. No consensus has been reached for a clear definition and categorization. In the current study, we describe a cutaneous neoplasm; a squamomelanocytic tumor (SMT) with histological features combining those of a squamous cell carcinoma (SCC) and a malignant melanoma (MM). This is the second report of an oculocutaneous SMT, and concerns a subject with a 20-year history of solar lentigo coexisting with solar keratosis in the primary lesion. This type of tumor is quite rare, with a distinct cytological architecture and immunohistochemical features, and the differential diagnosis of SMT may be considered. However, the histogenesis, biological behavior and malignant potential of SMTs remain a matter of speculation. With regard to the treatment, complete surgical resection and close follow-up are recommended.
authors: Department of Pathology, First Affiliated Hospital, Medical College of Xi'an Jiaotong University, Xi'an, Shaanxi 710061,  P.R. China.
authors: Hong-Yan
authors: HY
authors: Wang
authors: Xue-Bin
authors: XB
authors: Zhang
authors: Ru-Juan
authors: RJ
authors: Su
authors: Chun-Bao
authors: CB
authors: Wang
authors: Xi
authors: X
authors: Liu
keywords: histogenesis; solar keratosis; solar lentigo; squamomelanocytic tumor