EWSR1 rearrangement is also present in a small number of non-mesenchymal tumors including benign and malignant myoepithelial tumors and hyalinizing clear cell carcinomas of the salivary glands [5-7], hidradenoma of the skin [8], clear cell odontogenic carcinoma [9] and primary hyalinizing clear cell carcinoma of the thymus [10]. The gene discussed is EWSR1; the disease is mesenchymal cell neoplasm.