“…[4,10,11] A definitive diagnosis is made based on the histopathological findings from either a resected tumor or a needle biopsy . [7] But from some autors, it is difficult to distinguish IMT from malignant tumors on the basis of small tissue samples obtained from needle biopsy [6,12] Histologicaly, these tumors are characterized by the presence of a proliferation of spindle-shaped cells surrounded by chronic inflammatory cell infiltration. Immunohistochemical study is helpful in diagnosing and distinguishes IMT from other types of tumors, which usually show positive staining for smooth muscle actin and vimentin.…”