Soap bubble appearance is seen in which meningo encephalitis
results from infection of the central nervous system with the yeast-like fungus Cryptococcus neoformans. It is the most common fungal infection and second most common oppounistic infection of the central nervous system. Gelatinous pseudocysts tend to give a "soap bubble" appearance on MRI Ref Harrison20th edition pg 2456
Cryptococcus
Mucormycosis
Tubercular
HSV
C.N.S