Balo's concentric sclerosis in a woman from Papua New Guinea

We report a case of Balo's concentric sclerosis (a variant of multiple scle rosis) from Papua New Guinea. A 42-year-old woman with a past episode of op tic neuritis presented with a left hemiparesis. Magnetic resonance imaging revealed a solitary large tumour-like right cerebral lesion with a pattern of concentric bands of different signal intensities. The diagnosis was esta blished by biopsy of the lesion. To our knowledge, this is the first report ed case of Balo's concentric sclerosis in the indigenous population of Papu a New Guinea.