In a previous report of a new phenotype with predominant scapulo-humeral-peroneal-distal myopathy associated with the Glu197Asp mutation in ACTA1, muscle biopsies did not show nemaline rods, nor could nemaline rods formation be demonstrated in an exhaustive functional in vivo or in vitro study. However, muscle biopsy in members of our family, carrying a similar clinical phenotype of some members of the original family and the same ACTA1 mutation, revealed the presence of numerous nemaline rods, suggesting that there must be other factors that explain the absence of nemaline rods.
Sporadic late-onset nemaline rod myopathy is a rare, acquired, sub-acute, adult-onset myopathy characterized by proximal muscle weakness and nemaline rods in the myofibers. In contrast to its congenital form, the prevalence in adult population is comparatively rare. Herein, we report a case of 60-year-old male who presented with insidious onset proximal muscle weakness with myopathic pattern on electromyography.
Background: Late-onset sporadic nemaline myopathy (SLONM) is a rare, treatable or potentially life-threatening muscle disorder that typically manifests late in life and is characterised by the presence of nemaline rods within muscle fibres, serving as the hallmark of the disease and the key to diagnosis.
Methods: We report a case of an elderly patient with subacute onset of severe weakness affecting the upper and lower limbs, neck extensors and abdominal muscles. A comprehensive laboratory workup was performed.
Background: Nemaline myopathy type 6 (NEM6) or KBTBD13-related congenital myopathy is the most prevalent type of nemaline myopathy in the Netherlands and is characterised by mild childhood-onset axial, proximal and distal muscle weakness with prominent neck flexor weakness combined with slowness of movements. The most prevalent variant in the Netherlands is the c.1222C > T p.
A class of genetically based congenital myopathies known as nemaline myopathies is defined by the development of nemaline rods within muscle fibers. We present a case involving an eight-year-old boy who presented with a history of delayed motor development, proximal muscle weakness, and neck flexor weakness. Muscle enzymes were normal, and electrophysiological studies revealed a myopathic pattern.
Background: Congenital myopathies are a group of heterogeneous inherited disorders, mainly characterized by early-onset hypotonia and muscle weakness. The spectrum of clinical phenotype can be highly variable, going from very mild to severe presentations. The course also varies broadly resulting in a fatal outcome in the most severe cases but can either be benign or lead to an amelioration even in severe presentations.
