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. 2021 Jun 1;31(1):30–36. doi: 10.1055/s-0041-1729119

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Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 3 — Perfusion changes in patient with “non-enhancing” basal cisterns: 35-year male presented with headache, fever, and altered sensorium. CSF PCR was positive for Mycobacterium tuberculosis . T2W ( A ) image shows normal appearing prepontine cistern ( black arrow ). T1 post contrast ( B ) image shows no enhancement in the prepontine cistern ( white arrow ). Physiological map ( C ) shows (mean K trans 0.047 minute ^–1 and mean Ve 0.067) low permeability of contrast in the cistern. Signal intensity–time curve ( D ) of the cistern shows reduced intensity with flattened baseline. CSF, cerebrospinal fluid; PCR, polymerase chain reaction.