MRI Eye-of-the-Tiger Sign in Organophosphate Poisoning. A Case Report.

We describe the eye-of-the-tiger sign on magnetic resonance imaging (MRI) of the brain in a 40-year-old man presenting with extra pyramidal symptoms like chorea, flexion neck dystonia, tongue tremors, dysarthria and postural instability as the sequelae of organophosphorus poisoning six months previously. This typical radiological sign has been described in extrapyramidal parkinsonian disorders including cortical-basal ganglionic degeneration, early onset levodopa-responsive parkinsonism and Steele-Richardson-Olszewski syndrome (progressive supranuclear palsy) but hitherto has not been reported in insecticide poisoning. T2-weighted scans showed low signal intensity surrounding a central region of high signal intensity in the anteromedial globus pallidus (gliosis), producing an eye-of-the-tiger appearance with the central hyperintense signal intensity better appreciated in T2W and fluid attenuated inversion recovery (FLAIR) sequences.