[Enterovenous fistula. An unusual complication of Crohn disease]. / La fistule entéro-veineuse. Une complication exceptionnelle de la maladie de Crohn.

We report a case of enterovenous fistula in a young 22-year-old patient with Crohn's disease associated with jaundice. Ultrasound and computed tomography showed stationary gaz and barium in the liver. Pathological examination showed a fistula between the lumen of the inflamed segment of the ileum and the superior mesenteric venous system. This unusual finding in Crohn's disease may be a severe complication.

[Magnetic resonance imaging in osteoid osteoma]. / Imagerie par résonance magnétique des ostéomes ostéoïdes.

The purpose of this study was to determine magnetic resonance imaging (MRI) features of osteoid osteomas and to evaluate the place of MRI in the diagnostic workup of suspected osteoid osteoma by comparing its diagnostic value with that of computed tomography (CT). Nine patients with radioclinical features highly suggestive of osteoid osteoma were investigated using bone scintigraphy, CT scan and MRI. MRI sequences were weighted for T1 (TR: 500 ms-TE: 34 ms), T2 (TR:2000 ms-TE:50-100 ms) and T1 after intravenous injection of gadolinium-DTPA contrast material. The appearance of the nidus and surrounding area were analyzed, as well as the accompanying inflammatory reaction involving the bone marrow, soft tissues or synovium. All patients had surgical treatment. Clinical recovery was achieved in every case. Histological studies confirmed the diagnosis of osteoid osteoma in 7 patients. In two cases, histological confirmation was not obtained and the exact nature of the lesion therefore remained in doubt, although clinical and scintigraphic findings as well as the subsequent course were consistent with the diagnosis of osteoid osteoma. In 5 cases, MRI proved inferior to CT scan for detecting the nidus. MRI disclosed edema of the bone marrow not seen on CT scan sections in 5 cases, edema of the soft tissues in three cases, and synovitis with joint effusion in one patient with an epiphyseal osteoid osteoma. At present, MRI plays only an ancillary role in the diagnosis of osteoid osteoma, which rests on the concomitant use of bone scintigraphy and CT scan.(ABSTRACT TRUNCATED AT 250 WORDS)

[Magnetic resonance imaging in the bone sites of malignant non-Hodgkin's lymphoma. Apropos of 16 cases]. / Imagerie par résonance magnétique dans les localisations osseuses des lymphomes malins non Hodgkiniens. A propos de seize observations.

The primordial role of MRI in the staging of primary or secondary bone tumors has been clearly established. The authors report a study of 16 patients with NHL with suspected bone involvement, investigated by conventional radiography, bone scan, CT, bone marrow biopsy and MRI. The authors believe that, in the future, MRI will have an important role in the staging and follow-up of treatment of bone lymphomas. Better than any other techniques, MRI provides a precise assessment of tumor extension. It also represents a valuable method for monitoring patients during treatment by visualising the course of the disease.