Characteristic finding of tuberculosis in Computed Tomography (CT) is:

In Tubercular Meningitis basal cisterns are most frequently affected, although often syln cisterns and other subarachnoid spaces may be involved. The Basal Cisterns are obscured by presence of inflammatory tissue exudate. Hydrocephalus is communicating and is usually present, i.e. it does not improve even if Anti tubercular treatment (ATT) is given. Calcification is commonly seen in the meninges at the base of the brain. Ventriculitis may be seen, but it is not common. Ref: Pediatric Imaging By Berry, Page 373 ; Cranial MRI and CT By Seungho Howard Lee, Krishna Rao, Zimmerman, 4th Edition ; Harrison's Principle of Internal Medicine, 16th Edition, Page 958