A Rare Case of Longitudinally Extensive Transverse Myelitis Associated with Isolated Hyperparathyroidism

Longitudinally extensive transverse myelitis (LETM) is typically associated with autoimmune, paraneoplastic, or infectious etiologies. We report a rare case of LETM in a middle-aged male with persistently elevated intact parathyroid hormone (iPTH) levels, normal calcium-phosphorus profile, and vitamin D deficiency, with complete recovery after corticosteroid therapy and vitamin D correction. This case raises the possibility of a rare parainflammatory association between isolated hyperparathyroidism and spinal cord demyelination.