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Lacunar Infarct in the Paramedian Pons Presenting as Contralateral Hemisensory Loss with Reverse Dissociation

Groups and Associations : Ray S, Bhardwaj S, Mathew T
Annals of Indian Academy of Neurology 2025

A 62-year-old gentleman, on treatment for diabetes mellitus and hypertension, presented with sudden onset of left upper and lower limb numbness of 4 days’ duration. On examination, there was impaired fine touch and joint position sensation in the left upper and lower limbs, while pain sensation remained unaffected (reverse dissociation). There was no evidence of cranial nerve deficits or motor or cerebellar deficit on examination. Deep tendon reflexes were normal, and the plantar response was flexor. Magnetic resonance imaging (MRI) of the brain showed an acute ischemic infarct in the right dorsal paramedian pons [Figure 1a]. Magnetic resonance (MR) angiogram was unremarkable. He was initiated on dual antiplatelets and statins. His symptoms gradually resolved over the subsequent week.