JAMA Neurology

Abdominal Clonus in the Setting of a T5 Spinal Cord Injury

This case report describes abdominal clonus diagnosed in a man aged 49 years with a history of a T5 spinal cord injury, kidney dysfunction, and obesity who presented with worsening involuntary movements of the abdomen.

Prozone Effect of the AQP4-IgG Test in a Patient With NMOSD

This case report describes a false-negative result of the aquaporin-4ñimmunoglobulin G (AQP4-IgG) test due to the prozone effect in a woman with neuromyelitis optica spectrum disorder (NMOSD).

A 62-Year-Old Man With Progressive Limb Weakness, Involuntary Movements, and HyperCKemia

A 62-week-old man had progressive lower extremity weakness and involuntary movements. Muscle magnetic resonance imaging revealed multifocal hyperintense lesions in the posterior thigh muscles, sparing anterior thigh and adductors. Biopsy of the right vastus lateralis showed fiber size variability and…

Diamond Sign in Calpainopathy

This case report describes the appearance of autosomal recessive limb-girdle muscular dystrophy in a 30-year-old man with lower limb weakness, asymmetric atrophy of thigh muscles, and wasting of calf muscles.