Clinical Reasoning: Pes cavus and neuropathy

An 18-year-old woman was referred to a neuromuscular clinic for neuropathy and tremors. She had been born full-term and had mildly delayed walking at 14 months. She was a toe-walker, clumsy, and when running, had difficulty keeping up with her peers. She was diagnosed with attention-deficit/hyperactivity disorder (ADHD) at age 7 and was found to have high arches and difficulty with heel-walking. EMG and nerve conduction studies (NCS) were...