Abstract
Background: Posterior fossa tumours is one of the most common tumours in pediatrics. The most common tumours include juvenile pilocytic astrocytoma. Differential diagnosis of pediatric brain tumours begins with accurate localization of the site of origin the tumours, which is the most important diagnostic features, Conventional MRI with contrast study remains the gold standard for evaluation of brain tumours.
Aim of Study: Is to assess role of MRI in evaluation of space occupying lesions seen at the posterior fossa in pediatric age group.
Patients and Methods: This retrospective study, including 40 children with their age ranging between 2 and 10 years. All the forty patients were examined by; axial T1 WI, axial T2 WI, coronal and axial FLAIR, post contrast T1WI was done after injection of Magnevist (0.1ml/Kg); DW images and ADC maps were acquired.
Results: MRI study revealed 16 cases diagnosed as medul-loblastoma (40%), 8 cases as Ependymoma (20%), 8 cases as juvenile pilocytic astrocytoma (20%), 6 cases as pontine Glioma (15%) and 2 cases as Schwannoma (5%).
Conclusion: Conventional MRI with DWI & ADC has high accuracy in the differentiation of posterior fossa tumours in pediatrics.