Involvement of CNS seen in approximately 5% of total patients of tuberculosis.
Usually due to hematogenous spread.
The variety of forms of involvement include tuberculous meningitis, tuberculomas, tuberculous abscesses, focal cerebritis, and the rarest one is miliary tuberculosis.
Miliary CNS tuberculosis is usually associated with tuberculous meningitis, a pathogenetic relationship is suspected between them.
At MR imaging appears as multiple tiny (< 2 mm), T2 hyperintense foci with nodular or ring enhancement on post contrast, disseminated through out supratentorium as well as posterior fossa.