الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The posterior cranial fossa posses unique diagnostic challenges. The area is small but it merits specific consideration as it contains, important structures as well as vital centers. Magnetic Resonance Imaging has unveiled the contents of the posterior fossa, showing if anatomical details. This study included 125 patients, 70 males and 55 females their age ranged from 2 months to 70 years All cases were subjected to full clinical examination, Magnetic Resonance Imaging, 70 of them had also post contrast study, computerized tomography (in 60 patients while the remaining patients had examined by CT previous to reference). Angiography was performed for 12 patients, 5 patients were examined by transfontanellar US and 7 patients by abdominal US. All data were analysed to demonstrate the MR findings in different pathological groups as well as its value, superiorty and limitation in comparison with CT to evaluate the role of MRI in the diagnosis of posterior fossa space occupying lesions. Patients were divided into five main !,JfOUpS according to their final diagnosis as follow ~ 14 patients with cystic malformation, 88 patients with neoplasms, 16 patients with vascular lesions, 3 patients with infections, while 4 cases were categorized as miscellaneous lesions.