MR imaging of a case of adenomatoid tumor of the adrenal gland

The aim of this case report is to describe the appearance on magnetic reson ance imaging (MRI) of an incidentally found adenomatoid tumor of the adrena l gland, and to evaluate the utility of MRI in characterizing this type of tumor. The appearance of the tumor was nonspecific on T1-weighted in-phase, opposed-phase, and T2-weighted images, as well as its behavior after param agnetic contrast administration, outlining the differential diagnosis among carcinoma, metastatic tumors, and pheochromocytoma. After surgery, the pat hologic diagnosis was adenomatoid benign tumor of mesothelial origin. Altho ugh MRI enables the characterization of most benign lesions of the adrenal gland, the appearance of other lesions is nonspecific. In our case. MRI did not assist in preoperative diagnosis, guiding us towards a diagnosis of ma lignancy.