Abstract
Leprosy has a predilection for peripheral nerves, but rarely does it involve the central nervous system (CNS). There is a single study of CNS involvement in leprosy showing vacuolar changes of motor neurons in medulla oblongata and spinal cord in autopsy findings. Besides this, there has been only one case report providing direct histopathological and molecular evidence of CNS involvement by leprosy in a living patient. Segmental necrotizing granulomatous neuritis (SNGN) is a rare condition affecting the peripheral nerves in leprosy usually seen as a complication of tuberculoid (TT) and borderline tuberculoid (BT) leprosy. We report the case of a 23-year-old male patient, a case of Hansen's disease (BT) who developed CNS involvement in the form of partial Horner's syndrome (right) and SNGN while on treatment. Magnetic resonance imaging of the brain revealed T2 hyperintense lesion on the dorsal aspect of left pontomedullary junction, suggestive of vacuolar degeneration of leprosy. Histopathology of greater auricular nerve (right) revealed SNGN.
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