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yeap it is Biopsy , sorry if I did not mention that the pt is HIV :-D

Becz this ring enhancing with contrast never fall only in 2 things either the toxoplasmosis or the Lymphoma ..

Guys who answered A, you are right(CMDT). I think biopsy is done to know what really you're really dealing with.

Lumbar puncture would have been a better bet.