Immune mediated necrotising myopathy (IMNM) is a rare autoimmune muscle disease linked to idiopathic inflammatory myopathies, typically diagnosed through a muscle biopsy that shows muscle damage without significant inflammation.
Historical terms like 'neuromyositis' describe some muscle conditions with nerve involvement, but no previous cases of polyneuropathy combined with IMNM have been documented.
A case study of a 35-year-old man revealed IMNM alongside non-length dependent axonal polyneuropathy, and he improved with steroid treatment, emphasizing the uniqueness of seronegative IMNM with nerve issues.