[Intradiploic epidermoid cyst: diagnosis by ultrasonography and MRI]. / Kyste épidermoïde intradiploïque: diagnostic par échographie et IRM.

Epidermoïd cysts are well documented. Whenever possible, surgery is always necessary. Intradiploic epidermoïd cyst are uncommon, especially in the occipital bone. Ultrasonography (US) may be useful and used instead of radiographs. As demonstrated in intracranial forms, diffusion-weighted MR Imaging (MRI) sequence can be useful for the diagnosis of epidermoid tumors and postoperative assessment of residual tumor. We propose to illustrate the usefulness of US and MRI in depicting an intradiploic epidermoïd cyst in a 27-year-old woman.

[Paradoxical embolism: an unusual cause of cerebral ischemia]. / Embolie paradoxale: une cause inhabituelle d'ischémie cérébrale.

Paradoxical embolism (PE) is an uncommonly diagnosed cause of unexplained ischemic cerebral event. Its diagnosis is based on established criteria and the failure to identify an arterial or cardiac embolic source. The association between patent foramen ovale (PFO) and cryptogenic stroke has repeatedly been demonstrated in clinical studies. Transesophageal contrast echocardiography is the best diagnostic test. Surgical or endovascular PFO closure is recommended for the long-term prevention of PE.

[Giant hydropic fibroma: a case report]. / Fibrome hydropique géant: à propos d'un cas.

Hydropic degeneration of a uterine leiomyoma is common. Giant forms are uncommon. Positive diagnosis may be challenging because the differential diagnosis includes other rare uterine tumors such as leiomyosarcoma. Uterine localization, the leiomyoma volume, margins with adjacent structures are best evaluated at MRI. Final diagnosis requires gross and microscopic examination. We describe such a diagnostic challenge in a 46-year-old woman with a giant hydropic leiomyoma.

[Plasmacytoma and AIDS: unusual duodenal localization]. / Plasmocytome et SIDA: une localisation duodénale inhabituelle.

We report an uncommon presentation of plasmocytoma in an AIDS patient. AIDS is associated with an increased risk of neoplasms. The incidence of Plasma Cell tumors in HIV-positive patients is greater than in non-infected patients. Multiple factors contribute to B cell neoplasms development.

[Ewing's sarcoma of the soft tissues: apropos of 3 cases and review of the literature]. / Sarcome d'Ewing des parties molles: à propos de 3 cas et revue de la littérature.

Three cases of extraosseous Ewing sarcoma are reported. This pathology of the young adult is very rare as shown by the review of the literature. Clinical or imaging (CT or MRI) findings are non-specific and diagnosis is based on histology. Nonetheless, this diagnosis should be considered in all patients with primary soft tissue tumors.

[Air in the bone? Diagnosis and treatment of a pneumatocyst of the ilium. Apropos of a case]. / De l'air dans l'os? Diagnostic et traitement d'un pneumatokyste de l'ilion. A propos d'un cas.

We present a case of symptomatic pneumatocyst of the ilium observed in a professional scuba diver exposed to pressure variations. Pneumatocysts are rare and except for one case reported in a clavicular localization, are always found in subchondral bone of the iliac or sacral side of the sacroiliac joint. Undoubtedly, air fills an intraosseous node. We report here the first case of efficient treatment achieved by filling the cyst via percutaneous access under scopic control.

[Role of MRI in spinal and spinal cord emergencies]. / Place de l'IRM dans l'urgence rachidienne et médullaire.

Out of 137 cases concerning the spine and spine cord, the authors demonstrate that MRI is nowadays fully integrated in urgency investigations. In all cord compression suspicions and in spine trauma investigations, it's place is found. Coil and software improvements allow to put CT and MR scanning delays on a line. This study underlines the necessity of being equipped with non magnetic life support systems allowing management of very fragile patients. In traumas, MR provides the lesion's authentification, it's type, it's unique localisation or not, and therefore an early functional prognosis. The discovery of spine cord involving lesions in neoplastic conditions allows to follow a therapeutic strateging for maintaining the motor function. In the end, the authors discuss about practical utility of MR in scuba diving decompression accidents. No lesion of the spine cord has been demonstrated in 25 patients, probably because of technical insufficiency.