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CT Head Cerebellar Mass

Findings: There has been interval development of a solitary hyperdense mass identified within the left cerebellar hemisphere. The mass measures approximately 3.1 x 3.3 cm and is slightly hyperdense. There is adjacent surrounding edema. There is mass effect on the fourth ventricle and mild diffuse hydrocephalus. There is mild tonsillar herniation through the foramen magnum. No additional lesions are identified given limitations of noncontrast CT. There is no hemorrhage or pathologic fluid collection. Linear fusion defect traversing the clivus is stable from the prior CT scan, and likely congenital in etiology. Frontal sinuses are hypoplastic. The remainder of the visualized paranasal sinuses are clear. Impression: Hyperdense mass within the left cerebellar hemisphere causing mass effect on the fourth ventricle, slight tonsillar herniation and hydrocephalus. Neurosurgery evaluation is recommended. The mass will be better evaluated with MRI which is already scheduled.