Dynamic compaction of cohesive granular materials: scaling behavior and bonding structures.

The compaction of cohesive granular materials is a common operation in powder-based manufacture of many products. However, the influence of particle-scale parameters such as bond strength on the packing structure and the general scaling of the compaction process are still poorly understood. We use particle dynamics simulations to analyze jammed configurations obtained by dynamic compaction of sticky particles under a fixed compressive pressure for a broad range of system parameter values.

Cranial reconstruction after a post-craniotomy empyema.

This article presents a case report of a cranioplasty performed after a post-craniotomy empyema with osteitis. The skull reconstruction was performed using a bioceramic implant and a combined muscular free flap of latissimus dorsi and serratus anterior. This procedure not only provided coverage of a wide skull defect but also allowed the filling of the intracranial dead space.

[Epidural intracranial hematomas: practical issues revealed by management of 100 recent cases].

We present a retrospective study on the management of 100 patients who presented epidural hematoma over a four-year period. Our goal was to provide an update on management of this injury. Computed tomography was performed because of the clinical presentation.

Unruptured intracranial aneurysm presenting with epiletic seizure.

Intracranial aneurysms are frequently present with subarachnoid hemorrhage. Less often they produce suggestive symptoms of cranial nerve dysfunction or intracranial tumor when very large. Their association with epilepsy has rarely been reported; such concurrence may not be a coincidence.

[Subperiosteal hematoma of the orbit. Three cases].

Orbital subdural hematoma should be considered in victims of head and face trauma with signs of exophthalmia. Early diagnosis and treatment, consisting of decompression, is mandatory to avoid long-term functional complications.

[Tuberculous abscess of the cerebellum. Apropos of a case].

A 22-year-old Asian man developed intracranial hypertension with a 38 degrees C fever. Two months earlier, he had undergone surgery and medical treatment for tuberculous otomastoiditis and pulmonary tuberculosis. The CT scan revealed multiple tuberculous abscesses of the cerebellum.

[Extradural hematoma of the posterior fossa].

Extradural hematoma of the posterior fossa (EDHPF) is considered to be a rare complication of head injuries. In early reports, diagnosis was made only at the time of autopsy. Today, CT scanning prompts early diagnosis leading to better outcome.

[Unusual extra-axial infra-tentorial localization of a cavernoma in the cisterna magna].

A case of an extra-axial cavernous angioma of the cisterna magna is described. The clinical presentation, radiographic features, treatment of that unusual location in the posterior fossa are discussed. The patient is a 31 years old man admitted for the sudden onset of occipital headache and instability.

[Distal aneurysm of the postero-inferior cerebellar artery. Anatomical and surgical considerations].

A patient with a rare peripheral aneurysm of the posterior inferior cerebellar artery (P.I.C.

[Spontaneous cerebellar hematoma in adults. 44 cases].

Spontaneous cerebellar hematomas account for 10 p. 100 of all spontaneous intra-cranial hemorrhages. In this series of 44 cases, 3 clinico-pathological groups are described on the basis of clinical and pathological data (small, middle and massive hematomas).

[Aneurysm of the internal carotid artery bifurcation. Technical reflections apropos of a series of 10 cases].

Cerebral aneurysms at the bifurcation of the internal carotid artery are uncommon and represent less than 10% of intracranial aneurysms. A recent series of 10 cases (out of a total of 221 aneurysms over a period of five years, from 1983 to 1988, i.e.

[Radiation-induced meningioma. 3 cases].

During the same year (1984), we have seen 3 cases of meningiomas following radiation therapy of the brain for previously diagnosed tumors. A causal relationship between irradiation and meningioma has been postulated. Nevertheless, the coincidental occurrence in same patient of two different histological lesions is possible.

Haemangioblastoma of the brain. Computed tomography and angiographic studies in 17 patients.

Between 1975 and 1983, 17 patients who underwent surgery for haemangioblastomas of the brain (16 lesions occurring in the posterior fossa) were studied with CT scans (17 cases) and vertebral angiograms (15 cases). The CT scans were superior for demonstrating a cystic tumour, its topography in the posterior fossa, its relationship to the fourth ventricle, and the presence and degree of an obstructive hydrocephalus. The vertebral angiographies were more sensitive and specific than CT for revealing the vascular nature, and were imperative in order to establish the supply and drainage of the tumours.

[Evaluation of 138 fractures of the cervical spine during a recent 5-year period (1979 to 1983). Therapeutic approaches].

138 cervical spine fractures are reviewed during a recent period of 5 years (1979-1983). Their frequency stay high. The serial concern 67% of men and 33% of women.

[Meningeal fibrosarcomas].

The authors present 4 operated cases of primary fibro sarcomas of the dura mater. Only, a few number of cases had been described in the literature. In Zulch's classification (1957) of 6000 brain tumors, there were 162 cases of sarcoma (i.

[Post-traumatic intracerebral hematomas. Apropos of a series of 38 cases].

Our study is based on the analysis of traumatic I.C.H.

[Fracture dislocation of the sacral spine with cauda equina lesion. Report of two cases (author's transl)].

Transverse sacral fractures with cauda equina lesion appear only sporadically in the world literature. In our medical center 667 spine fractures were admitted during a twelve year period and we report only 2 cases of sacral fractures with neurological lesions (0,20%). The neurological abnormalities that occur are a perianal sensory loss with bladder and anal sphincters disturbance.

[Clinical pathological study of two cases of gliosarcoma (author's transl)].

The authors report 2 cases of frontal tumors in adult men with neuroradiological signs of malignant glial tumor. Histological study allowed to diagnose a mixed gliosarcomatosis tumor. Scannographical, histological and ultrastructural signs are specifically studied.

[Arterio-veinous malformations located within the occipito-cerebello-mesencephalic dihedral (author's transl)].

About 4 cases of arterio-veinous malformations located within the occipito-cerebello-mesencephalic dihedral (which is this region of the brain including the cistern of Galen and the surrounding formations : the quadrigeminal bodies forwards, the splenium of the corpus callosum upwards, the upper face of the cerebellum and the pedonculus cerebellaris superior below) the authors related their own experience. These 4 cases are detailed from a clinical point of view. Them, a synthetic study is undertaken in which a comparison is done between the literature and the clinical features encountered : headache, sub-archnoid hemorrhage, impairment of consciousness, clinical features such as cranial nerve impairment, nystagmus motor impairment, cerebellar deficit, hydrocephaly.