Reason: underlying lesion of SAH History: SAH. There is increased T1 signal in the right cerebellum corresponding to subacute hemorrhage seen on the prior exams. This is associated with mild increased T2 signal. Hemorrhage is seen along the posterior aspect of the right cerebellum extending into the cisterna magna as well as within the right ambient cistern. Fluid in the occipital horns of the lateral ventricles also likely represents subacute hemorrhage and is similar to the prior exam. No abnormal signal is seen within the left frontal lobe to correspond with finding on prior CTs. Susceptibility along the tentorium bilaterally is likely the result of hemorrhage.There is no evidence of mass, however due to the lack of postcontrast sequences, an underlying lesion in the right cerebellum at the site of hemorrhage cannot be excluded. Prominent ventricles and sulci suggest mild atrophy. Scattered punctate subcortical and periventricular T2 hyperintensities without diffusion restriction are nonspecific but likely represent mild small vessel ischemic disease. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull and scalp soft tissues are grossly unremarkable. Dysplastic maxillary sinuses with mucosal thickening
1.Limited exam, which was terminated prior to pre and postcontrast T1 and MRA sequences due to patient claustrophobia.2.Overall stable right cerebellar hemorrhagic contusion and subarachnoid hemorrhage. Due to lack of postcontrast and MRA sequences, and underlying mass or vascular anomaly in the right cerebellum cannot be excluded.3.Mild chronic small vessel ischemic disease and atrophy.