24-year-old male with history of tumor resection presents with headache; evaluate for subarachnoid hemorrhage There is a periaqueductal mass, with lymphoplasmacytic histology, that shows interval enlargement from the previous CT on 9/11/2008 now measuring 33 x 30 mm (image 12, series 2) as compared to the previous measurement of 23 x 20 mm. However, there is no significant change compared to the MRI study on 10/12/2009. Again seen is a right ventriculostomy tube that extends to the body of the right lateral ventricle.There is no evidence of intracranial hemorrhage or acute hydrocephalus. The ventricles and basal cisterns are normal in size and configuration.Postsurgical changes from a right frontal craniotomy are again noted. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Periaqueductal mass whose pathology is suggestive of lymphoplasmocytic neoplasmventriculostomy as described above. No acute intracranial hemorrhage or hydrocephalus.