<prompt> Soap bubble appearance on MRI brain is characteristic of?Tubercular meningitisNeurocysticercosisCryptococcal cystsEpendymoma  <response>: Ans is c i.e. Cryptococcal cysts Gelatinous pseudocysts caused by Cryptococcus tend to give a soap bubble appearance on MRI.MRI findings in neural cryptococcosis One of the most frequently described feature on MRI are dilated perivascular spaces and basal ganglia pseudocysts. Signal characteristics can vary dependant on the form of infection.A. Meningeal disease T1 C Gd: can show leptomeningeal enhancementB. Cryptococcomas Tl: low signal T2 FLAIR: high signal Tl C Gd: variable, ranging from no enhancement to peripheral nodular enhancement.C. Gelatinous pseudocysts Tend to give a soap bubble appearance. Tl: low to intermediate from mucin signal T2: high signal FLAIR: low signal 