Acute pure sensory neuropathy

Acute pure sensory neuropathy (also known as acute sensory neuropathy or acute sensory neuronopathy) is a rare peripheral nervous system disorder characterized by the rapid onset of widespread sensory loss, sensory ataxia, and pain, with little or no motor nerve involvement. The condition primarily affects the sensory neurons of the peripheral nervous system, including the dorsal root ganglia and their associated nerve fibers. Patients typically experience numbness, tingling, burning pain, loss of proprioception (position sense), and impaired coordination due to sensory ataxia. Deep tendon reflexes are usually diminished or absent. The condition can be severely disabling due to profound loss of joint position sense, leading to difficulty walking and performing fine motor tasks despite preserved muscle strength. Acute pure sensory neuropathy is classified under the Guillain-Barré syndrome (GBS) spectrum and inflammatory neuropathies, as reflected by its ICD-10 classification (G61.0, Guillain-Barré syndrome). It is considered an immune-mediated condition, and onset may follow a preceding viral infection or other immune-triggering event. Nerve conduction studies typically show reduced or absent sensory nerve action potentials with preserved motor conduction. Cerebrospinal fluid may show albuminocytologic dissociation (elevated protein with normal cell count), similar to classic GBS. Treatment generally follows the approach used for GBS and related immune-mediated neuropathies, including intravenous immunoglobulin (IVIg) and plasmapheresis (plasma exchange), though evidence specific to this rare variant is limited. Supportive care, pain management, and rehabilitation are important components of treatment. Recovery is variable; some patients improve substantially while others may have persistent sensory deficits.

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