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• Vol.63 No.12
• CLINICA NEUROL, 63: 836−842, 2023
• Vol.63 No.12 contents

Case Report

A case of myofibrillary myopathy due to Bcl2-Associated Athanogene 3 (BAG3) mutation complicated by peripheral neuropathy

Risa Nagatomo, M.D.^1）, Yujiro Higuchi, M.D., Ph.D.^1）, Jun Takei, M.D.^1）, Tomonori Nakamura, M.D., Ph.D.^1）, Hiroaki Hashiguchi, M.D., Ph.D.^1） and Hiroshi Takashima, M.D., Ph.D.^1）

¹⁾ Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences

A 19-year-old female, normal at birth, grew up without neck movement when getting up. She needed a handrail to climb stairs since the age of 10 years old, and walked slowly since the age of 16 years old. Neurological examination revealed loss of deep tendon reflexes, decreased vibratory sensation, weakness of distal muscles of the lower extremities, and weakness of mainly cervical trunk muscles suspected to be due to myopathy. Nerve conduction studies suggested axonal polyneuropathy, and needle EMG showed short duration MUP, myotonic discharge, and rimmed vacuoles on muscle biopsy. Genetic analysis revealed a previously reported pathological mutation (p.P209L, heterozygous) in Bcl2-Associated Athanogene 3 (BAG3), and a diagnosis of MFM6 was made. P209L is a poor prognosis myopathy that develops in childhood and is associated with cardiomyopathy. P209L is a solitary myopathy associated with axonal neuropathy and characterized by apex foot contracture and weak neck to trunk flexion. This disease is suspected in young-onset neuromyopathy.
Full Text of this Article in Japanese PDF (2273K)

(CLINICA NEUROL, 63: 836−842, 2023)
key words: myofibrillar myopathy, BAG3, neuromyopathy, MFM6, hereditary neuropathy

(Received: 14-Aug-23)