Primary Central Nervous System Lymphoma Presenting as Multifocal Brain Abscesses

A previously well female presented with a history of progressive functional decline. She had a known history of generalized seropositive myasthenia gravis on long-term mycophenolate mofetil and pyridostigmine. MRI of her brain reported multiple cerebral abscesses based on radiological features. The patient was commenced on intravenous antibiotics, but there was no clinical or radiological response to treatment. Decision was made for a stereotactic biopsy. Intraoperative tissue cultures were negative for infection. However, histology reported B-cell lymphoma with morphological features changes typically seen in corticosteroid-treated lymphoma - an unexpected finding as no steroids were administered as part of her treatment. Owing to the unusual diagnosis, the case is presented in corroboration with current literature.