Open AccessNonsystemic vasculitic neuropathy in a patient with IgG-monoclonal gammopathy of undetermined significance
Author(s) -
Ryuta Kinno,
Yuyuko Osakabe,
Seiya Takahashi,
Shinji Kurokawa,
Yoshiyuki Owan,
Kenjiro Ono,
Yasuhiko Baba
Publication year - 2020
Publication title -
medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 148
eISSN - 1536-5964
pISSN - 0025-7974
DOI - 10.1097/md.0000000000019036
Subject(s) - medicine , monoclonal gammopathy of undetermined significance , gammopathy , prednisolone , sural nerve , peripheral neuropathy , biopsy , pathology , chronic inflammatory demyelinating polyneuropathy , polyneuropathy , nerve biopsy , skin biopsy , gastroenterology , dermatology , antibody , monoclonal , immunology , monoclonal antibody , diabetes mellitus , endocrinology
Rationale: Monoclonal gammopathy of undetermined significance (MGUS) is a plasma cell proliferative disorder that consistently precedes multiple myeloma. Peripheral neuropathy in patients with IgG-MGUS tends to vary in clinical phenotype. We report a rare case of a patient with IgG-MGUS who had nonsystemic vasculitic neuropathy (NSVN). Patient concerns: A 56-year-old Japanese woman presented with progressive sensory ataxia with episodic paresthesia. Her clinical and laboratory values were compatible with IgG-MGUS. A nerve conduction study suggested possible chronic inflammatory demyelinating polyneuropathy. However, intravenous immunoglobulin therapy was not effective. A sural nerve biopsy specimen revealed mildly reduced myelinated fiber density and myelin ovoid formation, with epineural arterioles infiltrated by inflammatory cells. Diagnoses: We accordingly diagnosed her condition as NSVN. Interventions: She was accordingly started on oral prednisolone (40 mg/d) at 3 months after the onset of her neurological symptoms. Outcomes: At 1 year after the oral prednisolone treatment was begun, the patient's neurological symptoms showed no worsening. Lessons: These findings indicate NSVN as a possible cause of peripheral neuropathy in patients with IgG-MGUS. Cumulatively, our findings highlight the need for a nerve biopsy for peripheral neuropathy in patients with IgG-MGUS as a possible cause of NSVN. The early diagnosis of NSVN is expected to be beneficial for such patients.