Magnetic Resonance Imaging (MRI) is chiefly characterized by its natural contrast and by its capability of producing images in the three spatial directions. Although nearly all pathological tumors have prolonged T1 and T2 relaxation times and therefore it seems to be difficult to distinguish them one from another, significant pathological particularities can be obtained by comparing T1 and T2 weighted images. MRI is of particular interest to provide morphologic data and to demonstrate the relationship of tumors to vascular axes. Furthermore information in three dimensions (scans along transaxial, sagittal and coronal planes) is compared to produce a detailed morphological analysis of the tumor and of the adjacent structures. 0,5 T imaging was performed in 25 patients with pathologic pelvis and in 5 normal volunteers.