Brain Nocardiosis Mimicking Intracerebral Invasion on 68 Ga-Pentixafor PET/CT in a Patient With Multiple Myeloma.

Brain nocardiosis is an uncommon but severe disease associated with high mortality. We present a case of brain nocardiosis with elevated tracer uptake on both 68 Ga-pentixafor and 18 F-FDG PET/CT, mimicking intracerebral invasion of multiple myeloma. This case demonstrates that nocardiosis should be considered in the differential diagnosis of brain lesions found on PET/CT with increased tracer accumulation in immunocompromised patients.