A 30-year-old man presented with a chronic history of headache that has worsened significantly in the last week. History Investigations for the same problem 9 months ago ruled out sinus disease. He is concerned that this may be due to a brain tumor. Several relatives have died of various types of cancer. There was no history of definite head trauma, but he had various sporting injuries. There was no other history of significant illness.
Examination On questioning, the headache was reported to be present on waking and worsened on coughing. There was papilloedema on examination of the eyes but no focal neurology was demonstrated. The examination was otherwise normal. Axial CT images of the brain at the level of the third ventricle (Image 1) and the fourth ventricle (Image 2) are attached. MRI confirmed hydrocephalus in periventricular tissue. What is the probable diagnosis for this…
