brain, spinal cord, and nerve disorders
Hereditary Neuropathy With Liability to Pressure Palsies (HNPP)
Symptoms of HNPP
Hereditary neuropathy with liability to pressure palsies commonly affect nerves that run close to the body’s surface near a bone. For example, the following nerves are often affected: The peroneal nerve near the knee, resulting in Peroneal nerve palsy None The ulnar nerve in the elbow, resulting in Ulnar nerve palsy None The median nerve in the wrist, as occurs in Carpal Tunnel Syndrome None Numbness, abnormal sensations (such as tingling), or weakness occurs periodically in the affected area. For example, peroneal nerve palsy weakens the muscles that lift the foot. As a result, people cannot lift the front part of their foot (a condition called footdrop) and may drag the front part of the foot along the ground as they walk. Symptoms vary from unnoticeable and mild to severe and incapacitating. Episodes may last several minutes to months. They may recur, sometimes involving different nerves. After an episode, about half of affected people recover completely, and most of the rest have mild symptoms. 