INTRA NODAL PALISSADING LEIOMYOBLASTOMA E XPRESSING HMB-45

With a follow up of 14 years, a benign intra nodal palissading smooth muscle tumor is reported as an original lesion because of the expressi on of HMB 45. This antibody is now well known to be expressed by non m elanocytic smooth muscle lesions, like angiomyolipoma, << sugar tumors >> of the lung, pulmonary lymphangiomyomatosis and some others, often linked to tuberous sclerosis. The case reported seems to be a new mem ber of the merging concept of << Perivascular Epithelioid Cells (PEC) >>.