Fig. 13.

PATHOLOGY: IMT of the iliopsoas muscle. a Axial and b coronal reformations of contrast-enhanced CT where an ill-defined and heterogeneous mass encompassing iliopsoas muscle and external iliac vessels, mimicking malignant sarcomatous neoplasm was observed. c Sample of the lesion obtained after surgical excision of the mass. Proliferation of fibroblast with a diffuse infiltration of lymphocytes, eosinophils and macrophages were found. No mitotic figures or cellular atypia were present. The mass was well-defined and no signs of invasiveness were found