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Kamran Tabaddor and James LaMorgese

✓ A patient with acute subdural hematoma was successfully treated with hemicraniectomy. He developed contralateral weakness 4 months after surgery which was reversed by cranioplasty. The presumptive mechanism is a gradient between atmospheric and intracranial pressure. Early cranioplasty is suggested to prevent this phenomenon.

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Anthony Marmarou, Kenneth Shulman, and James LaMorgese

✓ The distribution of compliance and outflow resistance between cerebral and spinal compartments was measured in anesthetized, ventilated cats by analysis of the cerebrospinal fluid (CSF) pressure response to changes in CSF volume. Cerebral and spinal compartments were isolated by inflating a balloon positioned epidurally at the level of C-6. The change of CSF volume per unit change in pressure (compliance) and change of CSF volume per unit of time (absorption) were evaluated by inserting pressure data from the experimental responses into a series of equations developed from a mathematical model. It was found that 68% of total compliance is contributed by the cerebral compartment while the remaining 32% is contained within the spinal axis. The cerebral compartment accounted for 84% of total CSF absorption. The mechanism for spinal absorption appears to be similar in that no differences were obvious on the basis of pressure dynamics.

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Stephen D. McDonald, Stanley E. Von Hofe, Steven G. Dorfman, Richard M. Jordan, James R. LaMorgese, and Robert L. Young

✓ Transsphenoidal microdissection has been proposed as a preferred means of treating Cushing's disease. This procedure allows the surgeon to remove a pituitary microadenoma and at the same time to preserve normal tissue. Two cases described here were treated by this method. An interesting and important observation was that neither patient appeared to be cured for 2 to 6 weeks after surgery, as assessed by dexamethasone suppression. Later, normal suppressibility occurred and the course of each patient was compatible with cure. Patients treated by this method should not be automatically retreated because of adrenocorticotropic hormone (ACTH) non-suppressibility in the early postoperative period.