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This work corroborates anatomical data well known since G. Lazorthes about the main trunk of the middle cerebral artery. The data are interesting in various fields: Sylvian aneurysms, big sphenoïd ridge meningiomas, extra-intra cranial micro neurosurgical anastomoses. This work is based upon 280 angiographic pictures, 20 dissections of brain arteries and 12 plastic injections of the brain arterial vascular tree. The most important data to point out are variations of length and of division (no division, simple bifurcation, trifurcation or multiple divisions), variability in the central arteries and some rare anomalies like accessory middle cerebral arteries and duplication.

The cystic dilation of the sub-arachnoidal space individualised by Tarlov in 1938, may be integrated in the diagnosis of non discal surgical sciatica. The classification proposed by Lazorthes sumes up the eventualities encountered at the lombo-sacral level. The clinical study of five personal observations and the analysis of literature enable the establishment of a clinical picture evoking the anomaly. It would appear that the affection is characterised by lumbago or lumbo-sciatica, the attacks separated by free intervals. In an acute period the algia lessens in the Trendelenbourg position. A significant sign would be the pain on moving the sacrum. Among the complementary examination the radiographic study of the sacrum with tomographies is indisplusable, the diagnosis is based on the radiography of spinal nerve roots with late time in a vertical position. Medico-surgical treatment is in order, it gives a favorable result when surgical criteria have respected: invalidating evolutive algia with or without a clear sign of deficiency. The surgical result is essentially conditioned by a strict indication.

Over a period of 9 years, 139 patients with a mean age of 61 years were operated upon for disorders due to narrow lumbar vertebral canal. Clinical expression varied: lumbago, movement sciatica, intermittent claudication... Importance must be attached to discordance of examination findings in apparently benign root pain (67% of cases). The two key examinations of radiologic investigation are radiculography and a CT scan. Treatment is surgical, generally by a two-stage wide laminectomy combined with abrasion of an articular facet (64%), excision of osteophytic pads (35%) and/or treatment for a soft herniated disc (26%). Recovery was obtained in 35% of cases and pronounced improvement in 49% (84% of very good and good results) as evaluated by patients and surgeons.

From 300 cases of spontaneous intracerebral hematomas, 5 parameters are extracted they are: Age, sex, level of consciousness, localisation of hematomas and risk factors. A value, varying from 1 to 5 is attributed to each parameter, the sum of values give a score for each patient. This score allows the clinician to predict, within the early 48 hours, the vital prognosis. Survival chances are: 80% if score between 5 and 8; 60% if score between 9 and 13; 40% if score between 14 and 17; 20% if score equal or superior to 18.