The likelihood of rupture of unruptured intracranial aneurysms that were less than 10 mm in diameter was exceedingly low among patients in group 1 and was substantially higher among those in group 2. The risk of morbidity and mortality related to surgery greatly exceeded the 7.5-year risk of rupture among patients in group 1 with unruptured intracranial aneurysms smaller than 10 mm in diameter.

A series of 113 consecutive patients underwent surgical treatment for a supratentorial meningioma between January 1955 and January 1975. There were 73 women and 40 men. There were 10 postoperative deaths (8.8%). The surgical procedure was graded according to Simpson's classification. 18 patients had a recurrence (17.5%). Women had a preponderance for recurrence. In our series the recurrence rate was 13 for women (17.8%) and 5 for men (12.5%). There was no correlation with the age of the patient or site of the tumour. The grade of initial surgery and the histology of the tumour were shown to be important.

With a multidetector scintillation camera regional cerebral blood flow, rCBF, was evaluated in 13 patients with subarachnoid haemorrhage. Mean CBF was subnormal, and there seems to be a relationship between CBF and severity of the neurological deficit. The regional pattern showed ischaemic as well as hyperaemic areas. Vasospasms mostly produced ischaemic areas, roughly corresponding to the region supplied by the involved artery. The hyperaemic areas were striking. This hyperaemia can perhaps be regarded as a reaction to initial ischaemia.

Forty-three patients under the age of 19 in whom a lumbar disc protrusion was diagnosed and surgically demonstrated are reviewed. The symptomatology resembles that of adults. In 19 cases there was clear relation of trauma to the onset of symptoms. The results of surgical treatment are discussed.

Computed tomography of the carpal tunnel was performed in the hands of both patients and controls in a neutral position, in flexion and in extension. The median nerve was not compressed between the long flexors and the flexor retinaculum in either flexion or extension of the wrist. In flexion, the nerve usually moved dorsally, away from the flexor retinaculum. No difference could be found between the cross-sectional area of the carpal tunnel between patients and controls.