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Ossifying fibroma is a rare benign fibro-osseous lesion that usually affects mandible and maxillary bone. Their localisation to paranasal sinus and skull base is uncommon.We report a huge recurrence of ossifying fibroma of the ethmoid paranasal sinus involving the skull base.Ten years after the removal of ossifying of the ethmoid 34 year old man presented headache with diplopia. Computed tomography (CT) and magnetic resonance imagery (MRI) showed a recurrent tumour witch extended to the nasal cavity, the sphenoid and the posterior ethmoid sinuses, and the skull base. The tumour was totally removed using an anterior subcranial approach with removal of the orbital rim. Histopathology confirmed an ossifying fibroma. Two years later a subdural empyema with frontal suppuration necessited to remove the frontal bone flap, which was re-constructed 12 months later using a synthetic material.Ossifying fibroma is a rare, benign tumour witch may recur if incomplete resection is performed. A long follow up with CT scan and MRI is required.

International audience

International audience

Hemangiopericytoma (HPC) was diagnosed in a 65-year-old man in 1991. Initially the tumor was located in the maxillary sinus. Resection was followed by multiple recurrences involving the infratemporalis fossa (ITF), the nasopharyngeal region, and the right tonsillar region. Over a 10-year-old period, the histology pattern remained unchanged. Multiple approaches, as described in the literature, were used for resection depending on the site of the recurrence. To data, no malignant structure has been identified. Pain and cranial nerve deficits (V2, V3) have been the main squeleae. This case points out the limitations of radical resection because of the difficulty of the approach to this anatomic region. CT scan must be performed to choose the best access route depending on the primary site of the tumor and its extension.

The corpus callosum is a neopallial commissure. In inferior vertebrates, the pallial commissures are essentially represented by the anterior commissure. The corpus callosum appears in mammals only. Eutherians alone have a corpus callosum, the other mammals have an anterior commissure and hipocampal commissure. In humans, the different portions of the corps callosum are described on a median sagittal slice: rostrum, genu, body, isthmus, splenium. Klingler method allows to dissect fibers of each of these portions and their relationship with the corona radiata and optic radiations. These latter are separated from the ventricular ependyme by callosal radiations. Finally, each part of the corpus callosum participates in lateral ventricle wall formation.

Une carte des divisions statistico-administratives des pays d'Amérique du Sud, au niveau le plus fin, a été réalisée pour servir de base à la création de fichiers utilisables par le logiciel de cartographie Cabral 1500 (livrés sur le CD-Rom joint à la revue). Telle que, bien que "muette", elle est riche d'enseignements sur l'organisation politique et administrative du continent, comme le montrent des analyses portant sur les pays andins, le Brésil et le Cône Sud. (Résumé d'auteur)