Two obese women, both of whom were 42 years of age, were examined for pseudotumor cerebri. Intracranial venography revealed increased pressure in the dural venous sinuses and the right atrium. The increased right atrial pressure was attributable to the patients' obesity. Both patients underwent bariatric surgery to achieve weight loss. Approximately 1 year later, a clinical evaluation showed that in both women the pseudotumor cerebri had resolved. Repeated measurements of dural venous pressure indicated that the patients' pressures had returned to normal. Obese patients with pseudotumor cerebri and stable visual symptoms are best treated with weight loss to avoid shunt placement or optic nerve sheath fenestration.
Objective: To determine the safety and efficacy of lumboperitoneal (LP) shunts in carefully selected children with abnormalities of the absorption of cerebrospinal fluid. Methods: Magnetic resonance imaging studies, indications for treatment and pre- and postoperative symptoms of 25 patients (mean age 9.6 years) who had undergone LP shunting in the past 10 years in a single pediatric neurosurgical practice were analyzed retrospectively. Results: Indications for treatment included postoperative pseudomeningocele, pseudotumor cerebri and a severe form of slit ventricle syndrome. Preoperative symptoms resolved completely in all 25 patients as a result of the shunt, and no patient developed symptomatic or radiographic hindbrain herniation. Twenty-one shunts incorporated valve mechanisms. Conclusion: LP shunts may be used for specific indications without excessive risk of hindbrain herniation.
The CMVP shunts are an excellent option for patients who are not candidates for LP shunts but who have high ICP and ventricles that do not enlarge at shunt failure. The ability to access the spinal fluid in the cortical subarachnoid space presumably accounts for this success.
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Patients with severe intermittent brainstem dysfunction after decompression of Chiari I or Chiari II malformations should have laboratory studies of glucose levels performed at the time of the episodes to rule out hypoglycemia.
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