[en] This paper reports on one hundred fifty patients with suscepted acoustic neurinoma examined with a 1.5-T MR imaging. All patients were injected with Gd-DTPA or Gd-DOTA, and T1-weighted spin-echo sequences were obtained. Thirty postoperative patients underwent pre- and post contrast MR imaging. Forty-five patients had normal findings. In 88 patients, one or two neurinomas were detected. Eighteen cases were equivocal. In seven cases, contrast enhancement was due to other tumors (five meningiomas, one arachnoidocele, one intracanalicular hemangioma). In six other cases, misinterpretation resulted from partial volume effects with the bone marrow of the petrous bone (four cases), or thrombosed vessels in the prepontine cistern (one case). In patients, previously operated on, increased signal was due to tumor recurrence (12 of 30 cases) but also to the presence of a postoperative fatty graft (seven of 30) or an inflammatory enhancement of the canalicular meninges (five of 30). Most of the diagnostic problems may be obviated with use of precontrast MR imaging, multidimensional 3-mm sections, and fast imaging