9-year-old male with history of right lateral ventricular tumor (low grade astrocytoma) complains of occipital head pain more to touch and not headache. Evaluate for infection or abnormality. CSF-density cyst is again seen in the right parietal lobe. It measures approximately 4.7 x 5 cm in greatest axial dimension; measuring approximately 4.4 x 4 cm on prior MRI from 2008. The size and configuration of the ventricles and basal cisterns are unchanged. There is no evidence of intracranial hemorrhage, mass or edema. Right intracranial catheter is again seen in the extra-axial space on the right with tip at the level of the right sylvian fissure. Thinning of the right parietal skull reflects old craniotomy. The calvaria and skull base are otherwise radiographically normal. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
Slight enlargement of CSF-density cyst in the right parietal lobe. Otherwise, stable postsurgical changes as above. Please note that lack of IV contrast limits evaluation for infection.