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A Rare Case of Asymmetric Progressive Supra Nuclear Palsy Diagnosed In vivo with Magnetic Resonance/Positron Emission Tomography.

PSP and CBD are usually multi system sporadic disorders characterized by tau inclusions in neurons and glia. The clinical and neuroimaging features are different .However in some cases overlapping of features are noted. Here we present a case of a 65 years old female patient, presenting a 3 years history of insidious onset of asymmetric right upper and lower limb dystonia, followed by slowness, falls and injuries to the back, Parkinsonism, urinary incontinence and cognitive dysfunction and upward gaze palsy. MRI findings were suggestive of moderate cerebral and cerebellar atrophy with prominent ventricular system, reduced antero-posterior midline midbrain diameter, at the level of superior colliculus on axial imaging (morning glory sign was positive) on the left side. PET showed asymmetric hypo metabolism noted in the left superior and middle frontal gyrus, superior temporal and mid temporal gyrus in addition to striatum and thalamus, as well as midbrain, pons and right cerebellar hemisphere. Overall MR/PET was suggestive of unilateral PSP (left) and it corroborated with clinical history of unilateral dystonia and supranuclear gaze palsy. Based on MRI the differential considered was also CBD, but PET showed metabolic activity in the motor cortex. Additionally based on the hummingbird sign and morning glory sign a rare diagnosis of unilateral PSP could be made which also corroborated with the clinical picture.The case report emphasizes the utility of PETMRI simultaneously in situations like these to pick atypical variants or cases with overlapping pathology to reach a diagnosis with in vivo imaging methods.

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