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Pseudotumoural hemicerebellitis: imaging findings in two cases

¹ Radiology Unit, Hospital de Base do Distrito Federal, SMHS 101, Bloco A, Subsolo, CEP 70335-900, Brasilia, DF – Brazil, ² Magnetic Resonance Department, Clinica Radiologica Vila Rica, SHLS 716, Centro Clinico Sul, W423/431, CEP 70390-907, Brasilia, DF – Brazil and ³ Pediatric Neurology Unit, Hospital de Base do Distrito Federal, SMHS 101, Bloco A, 7° andar, CEP 70335-900, Brasilia, DF – Brazil

Correspondence: Dr Sergio Lopes Viana

Pseudotumoural hemicerebellitis is exceedingly rare. It may closely resemble a tumour either clinically or on imaging, and a high index of suspicion is required to avoid unnecessary surgical procedures. MRI is the most useful diagnostic tool, and reveals a swollen cerebellar hemisphere, hyperintense in T₂ weighted images. A pattern of predominantly pial contrast enhancement, absence of a well-defined mass and regression of the abnormalities in follow up examinations help to rule out malignancy. We report two cases of pseudotumoural cerebellitis (an 11-year-old girl and a 9-year-old boy) studied with CT and MRI.