Intraradicular disc herniation: a case report and review of the literature.

Intradural disc herniation accounts for < 0.3% of all disc herniations. Intraradicular disc herniation accounts for 4.

Clinical dosimetry during cerebral arteriography.

Radiation dosimetry measurements on angiographer, X-ray technician and patient were performed during 18 femerocerebral angiograms. Lithium fluoride (LiF) thermoluminescent dosimeters were placed on various body areas to measure X-ray exposure. The results of this study indicate that radiation exposure received by medical personnel are well within the maximum permissible dose range established by the National Council of Radiation Protection.

Megalencephaly in infants and children. The possible role of increased dural sinus pressure.

Seven children studied because of clinical macrocephaly and suspected hydrocephalus ultimately proved to have megalencephaly apparently due to an increase in sagittal sinus venous pressure as established from infusion studies. Unexplainably, these patients were all males. All were seen initially between 2 and 8 months of age.

Pre- and postoperative cerebrospinal fluid absorption studies in patients with myelomeningocele shunted for hydrocephalus.

Nine infants with myelomeningocele and hydrocephalus had cerebrospinal fluid formation and absorption studies before insertion of a ventriculoperitoneal shunt. Six were also tested postoperatively. The preshunt formation rate varied from 0.

A practical method for measuring hydrodynamics of cerebrospinal fluid.

A method for measuring the formation and absorption rates of cerebrospinal fluid is described which can be carried out relatively rapidly and with a minimum of expensive apparatus. It has been found particularly useful in the evaluation of patients with hydrocephalus.

Hydrodynamics of shunt valves.

A study of differential pressure valves (DPV) used in the treatment of hydrocephalus was undertaken to determine their pressure-flow characteristics and compatability with the antisiphon valve (ASV). DPV could be classified into two groups: low resistance valves (LRV) and high resistance valves (HRV). The LRV maintains intraventricular pressure (IVP) near the closing pressure (CP) of the valve by permitting a high flow whenever CP is exceeded.