Monarch Disease Ontology entry MONDO_0007646 (Gamstorp-Wohlfart syndrome) is a rare peripheral neuropathy characterized by slowly progressive axonal, motor greater than sensory polyneuropathy combined with neuromytonia (including spontaneous muscular activity at rest (myokymia), impaired muscle relaxation (pseudomyotonia), and contractures of hands and feet) and neuromyotonic or myokymic discharges on needle EMG. It presents with distal lower limb weakness with gait impairment, muscle stiffness, fasciculations and cramps in hands and legs worsened by cold, decreased to absent tendon reflexes, intrinsic hand muscle atrophy and, variably, mild distal sensory impairment. Also known as: ARAN-NM, ARCMT2-NM, autosomal recessive Charcot-Marie-Tooth disease type 2 with neuromyotonia, autosomal recessive neuromyotonia and axonal neuropathy, myokymia, myotonia and muscle wasting.