57 year-old female with ataxia and cerebellar mass. Evaluate for evolution of cerebellar mass. Again noted is a posterior fossa space-occupying hypodense lesion measuring 3.5 x 2.6 cm and appears minimally decreased in size since the previous examination (Image 10; series 4). This previously measured 3.8 x 2.7 cm. There is an adjacent focus of hyperdensity in the right cerebellum measuring 1.9 x 0.8 cm which appears unchanged compared to previous study (Image 7; series 4). This previously measured 1.7 x 0.8 cm. Differential considerations include hematoma versus mass lesion with petechial hemorrhage. Contrast enhanced MRI could be considered for further evaluation of this finding. Again noted is effacement of the fourth ventricle associated with moderate supratentorial ventriculomegaly and transependymal edema which appears unchanged when compared to the previous study. These findings are likely related to obstructive noncommunicating hydrocephalus. The calvaria and skull base are radiographically normal. The visualized paranasal sinuses are normally pneumatized. There is opacification of the left mastoid air cells and thickening of the left external auditory canal which appears unchanged compared to previous study. Incidental noted is made of bilateral lens prosthesis. There is calcification within the left globe.
There is no significant interval change since the previous examination. 3.5 cm space-occupying mass lesion within the left cerebellum with an associated hyperdensity which could represent blood product or mass lesion with mineralization. There is associated effacement of the fourth ventricle and moderate noncommunicating hydrocephalus unchanged since the previous examination. MRI examination for further characterization is recommended.