Exophytic malignant brainstem mixed glioma in an adult: a case report

Anaplastic mixed gliomas are rare tumors that occur mostly in the cerebral hemispheres. They have a distinctive histological appearance characterized by the presence of two or more glial cellular constituents. The incidence of malignant mixed glioma of the brainstem and posterior fossa is extremely low. The authors report an unusual case of an exophytic malignant mixed glioma. Following subtotal resection, the patient received conventional radiotherapy, but continued to deteriorate, and died five months after surgery. The extensive literature review focuses on histopathology, clinical features, natural history, and possible treatment modalities of this unusual neoplasm.

Early combined management of frontal sinus and orbital and facial fractures

BACKGROUND

Historically, frontal sinus fractures and associated maxillofacial fractures were addressed at different times. We retrospectively reviewed our experience with a series of 79 consecutive patients with bitable frontal sinus fractures, most with associated facial fractures, who underwent early combined cranial and maxillofacial procedures.

METHODS

The operations were performed emergently for patients with open or depressed skull fractures and hematomas with mass effect, and electively within 2 weeks for those with closed fractures. The cranial procedures were performed first. The nasofrontal ducts were packed with "cigars" of bacitracin powder wrapped in Surgicel. All patients received antibiotics for 2 weeks.

RESULTS

Postoperatively, good subjective cosmetic results were obtained except in one patient. Eight patients with lumbar drains had expected temporary cerebrospinal fluid (CSF) leaks of less than 72 hours duration. Six postoperative intracranial infections (four cases of meningitis, one epidural empyema, and one intracerebral abscess) were detected; five of these occurred in patients with open depressed fractures. Patients with preoperative CSF leaks (p = 0.0039, Fisher's exact test) and open fractures (p = 0.065, Fisher's exact test) were more likely to develop intracranial infections.

CONCLUSION

The combined neurosurgical and maxillofacial repairs achieved good cosmetic outcomes, with relatively low morbidity. By combining the two-stage procedure into one stage, standard surgical and anesthetic risks could potentially be reduced. Preoperative CSF leaks and open fractures were associated with a higher incidence of postoperative central nervous system infection. Early operations did not appear to be associated with a higher complication rate.

Hormonal changes in normal and polycythemic high-altitude natives

Acute and chronic exposure to high-altitude (HA) hypoxia inhibits the renin-angiotensin-aldosterone system and may modify the release of atrial natriuretic peptide (ANP) in sea-level (SL) natives. In HA natives, the release of these hormones could be influenced by changes in blood volume or pulmonary arterial pressure. Twenty-four men residing in La Paz, Bolivia, at 3,600 m were separated into two groups: one normocythemic (HAN; with hematocrit < 57%; n = 13) and the other polycythemic (HAP; with hematocrit > 57%; n = 11). A control group of 9 SL residents was studied in normoxia (SLN) as well as after 4 days spent at 4,350 m (SLH). The groups were tested for plasma active renin (PAR), plasma aldosterone concentration, ANP, and potassium and norepineprine concentrations at rest and after a maximal exercise. Pulmonary arterial systolic pressure was assessed by a Doppler technique. It was observed that PAR and plasma aldosterone concentration at rest and after exercise were lower in the SLH than in the SLN group. PAR and norepineprine concentration were higher among highlanders than in the SLN group. Renin response to exercise was normal among the HAN group and slightly decreased among the HAP group, and an exercise-induced increase in aldosterone was attenuated in both HA groups. Aldosterone response to renin was maintained among the SLH group but was attenuated in the HA groups, possibly owing to a protective mechanism against salt and water retention. Resting and exercise ANP was lower in the HA groups than in the SLN group.(ABSTRACT TRUNCATED AT 250 WORDS)