Research Article: Cutaneous Syncytial Myoepithelioma with Positive CD34 Immunohistochemical Staining: An Unusual Tumor and a Challenging Diagnosis
Abstract:
Cutaneous syncytial myoepithelioma (CSM) is a rare type of cutaneous neoplasm that typically presents as a solitary and well-circumscribed nodule on the skin. It predominantly occurs on the upper and lower extremities of adult patients. Immunohistochemically, CSM is characterized by the co-expression of smooth muscle and epithelial markers. Fluorescence in situ hybridization (FISH) targeting the EWSR1 gene rearrangement is an important diagnostic tool for CSM. In our case report, we found the focal positivity for CD34, which has never been previously observed; this was mostly confined to a central area of the neoplasm.
Introduction:
Myoepithelial tumors are most commonly identified in the salivary glands, encompassing mixed tumors (pleomorphic adenomas), myoepitheliomas, and myoepithelial carcinomas. However, they have also been reported in other anatomical locations such as the sinonasal tract, larynx, and lung. In recent years, similar morphological lesions arising primarily in soft tissues and bones have been documented. Additionally, the recognition of cutaneous myoepitheliomas has emerged, categorizing them within the spectrum of…
Read more