[Duodenal leiomyoma. Contribution of imaging apropos of a case]. / Léiomyome duodénal. Apports de l'imagerie à propos d'un cas.

A leiomyoma of the duodenum was revealed by chronic anaemia. Radiography, echography and computed tomography provided images leading to the diagnosis of a 11 cm regular, homogenous sub-serous tumour of the duodenum without loco-regional or distant extension. The radiographic images suggested a benign tumour confirmed by the pathology examination.

[Luxation of a hypoplastic posterior arch of the atlas. Report of a case]. / Luxation sur hypoplasie d'un hémi-arc postérieur de l'atlas. A propos d'un cas.

A rare case of sagittal dislocation of the hypoplastic right semi-posterior arch of the atlas, complicating a cervical trauma, is described. The authors specify its radiographic and CT appearance. This is a congenital abnormality discovered accidentally, for which no specific surgical treatment was implemented.

[X-ray computed tomography in the surveillance of the course of acute pancreatitis. Values of a new classification of inflammatory lesions]. / La tomodensitométrie dans la surveillance évolutive des pancréatites aiguës. Intérêts d'une nouvelle classification des coulées inflammatoires.

378 tomodensitometric investigations were performed in cases of acute pancreatitis. The evolution of inflammatory lesions were analyzed with special attention to tissue aggressive inflammation in order to recognize early signs of gravity on CAT scans. Pancreatic lesions less than 15 mm in diameter called "hypodense islets-1" are compatible with oedematous lesions while lesions greater than 15 mm in diameter ("hypodense islets-2") are characteristic of developing necrosis. Tissue aggressive inflammatory lesions were classified in five grades retrospectively and showed that the incidence of abcesses was greater in grade II (76.5%) than in grade I lesions (11.75%).

[Pneumatocyst of the sacrum. Apropos of a case]. / Pneumatokyste du sacrum. A propos d'un cas.

We report a new case of asymptomatic pneumatocyst of the sacrum in a 45-year-old man with a history of lumbago. Pneumatocysts are rare benign osseous lesions filled with gas and always found in the subchondral bone of the sacral or iliac side of the sacroiliac joint. The diagnosis is made by CT scan. In the sacral location, the pneumatocyst is asymptomatic and surgical treatment is not justified.

[Computed tomography diagnosis of pancreatic abscess and its surgical drainage]. / Diagnostic scanographique des abcès pancréatiques et drainage chirurgical.

In a retrospective study of 40 patients with acute necrotizing pancreatitis, 16 developed abscesses. The follow-up CT Scan and a radio-surgical cooperation permitted an early diagnosis of pancreatitis and time of surgical act. The 16 abscesses had surgical drainage, 5 patients died.

Intra-arterial thrombus visualized on T2* gradient echo imaging in acute ischemic stroke.

BACKGROUND: MR signal loss related to arterial thrombosis leading to vascular susceptibility artifacts (VSA) has recently been reported on gradient echo images. The time course and sensitivity of VSA in acute stroke patients has been scarcely investigated. The aim of this study was to assess the frequency and course of VSA in acute stroke patients, to compare its sensitivity to distinct features of arterial occlusion as detected on FLAIR images or on CT scan. METHODS: Twenty-nine patients were scanned from 45 min to 6 h after stroke onset using identical MR parameters. All had an acute ischemic lesion identified on diffusion-weighted images, 25 had an occlusion of MCA or PCA confirmed by magnetic resonance angiography. RESULTS: VSA was detected in 22/25 patients having an occluded artery at the time of MRI examination. Flair disclosed a hyperintense vessel in all of these 25 cases, but CT scan revealed a hyperdense artery in only 15 cases. Follow-up studies showed that VSA can vanish or disappear after partial recanalization. When the artery remains occluded, VSA can decrease, disappear or increase in the next hours, possibly related to structural modifications of the thrombus with time. Most occlusions were due to cardiac and arterial emboli or to intracranial extension of carotid occlusion. CONCLUSIONS: VSA are frequent in the first hours of MCA or PCA occlusion in acute stroke patients. The sensitivity of VSA appears lower than the arterial hyperintensity on FLAIR images but higher than the hyperdense artery sign on CT scan. The extent and intensity of VSA can change with recanalization or structural modifications of the thrombus.