ROLE OF COMPUTED TOMOGRAPHY IN DIAGNOSIS OF POSTERIOR FOSSA SPACE OCCUPYING LESIONS

Abstract

The aim of this work is to evaluate tha accuracy, sensitivity and specificity of CT in the diagnosis of posterior fossa S.0.Ls. by comparing the CT results with the post-operative pathological diagnosis. The normal anatomy of the posterior fossa and its contents was mentioned. Also, its normal CT. anatomy before and after contrast injection was studied. The various radiological procedures for diagnosis of posterior fossa S.O.Ls. with the advantages and disadvan• tagess of each procedure were described with special attention on the role of CT on the diagnosis of different posterior fossa S.O.Ls. In our study; 134 cases of posterior fossa S.O.Ls. were studied, BO of these patients were males and 54 were females, their ages ranged from one year to 65 years. Full clinical examination and CT brain scan were performed for all cases. The CT findings of each lesion were described as regard its location, density, number, presence or absence of calcification, perifocal oedema, hydrocephalus and underlying bone changes in addition to the pattern of enhancement.