This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
[{'content': 'Soap bubble appearance on MRI brain is characteristic of? \nSelect and explain. \nA. Tubercular meningitis, B. Neurocysticercosis, C. Cryptococcal cysts, D. Ependymoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]