RESUMO
A rare case of giant extradural meningioma of anterior cranial fossa is being presented. A 25-year-old man presented with progressive loss of vision in both eyes of 3 months duration. Magnetic resonance imaging of brain showed a giant extradural mass lesion [8 x 9 x 6 cm], invading the ethmoidal sinuses both sides, occupying the anterior cranial fossa both sides. At surgery, the tumour was found to be in extradural plane invading ethmoidal sinuses. Near total excision of the mass was done which on histopathology was confirmed to be meningioma. Literature survey does not reveal any similar report
RESUMO
Cerebrospinal outflow resistance measurement [R[out]] is useful in the diagnosis, evaluation and monitoring of many disease states. The bolus lumbar injection method has been employed, using simple improvised bedside apparatus, to measure R[out] in various disease states affecting cerebrospinal fluid [CSF] dynamics, including normal pressure hydrocephalus [NPH], pseudotumour cerebri, post-meningitic and post-haemorrhagic hydrocephalus, using Marmarou's formula after establishing the R[out] values in normal population. In normal population, R[out] values ranged from 3.878-9.669 mm Hg/min/ml [mean 6.09 mmHg/min/ml]. Patients with normal pressure hydrocephalus, pseudotumour cerebri, and post-meningitic and post-haemorrhagic hydrocephalus had significantly higher R[out] values. The bolus lumbar injection method is a simple, fairly accurate, less expensive method for bedside measurement of CSF outflow resistance, which is affected in various disease states. R[out] values in normal Indian subjects is slightly lower than the other reported values for normal subjects. R[out] values correlated well with the outcome after shunt, in normal pressure hydrocephalus and other types of communicating hydrocephalus, and hence is a useful parameter for selection of patients for shunt surgery. It is also useful in establishing the diagnosis of pseudotumour cerebri