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Rabson–Mendenhall syndrome
Rabson–Mendenhall syndrome is a rare autosomal recessive disorder characterized by severe insulin resistance. The disorder is caused by mutations in the insulin receptor gene. Symptoms include growth abnormalities of the head, face and nails, along with the development of acanthosis nigricans. Treatment involves controlling blood glucose levels by using insulin and incorporating a strategically planned, controlled diet. Also, direct actions against other symptoms may be taken (e.g. surgery for facial abnormalities) This syndrome usually affects children and has a prognosis of 1–2 years.
==Symptoms==
The symptoms of Rabson–Mendenhall syndrome vary from case to case. Major symptoms of Rabson–Mendenhall syndrome include abnormalities of the teeth and nails, such as dental dysplasia, and deformities of the head and face, which include a coarse prematurely-aged facial appearance with a prominent jaw. A skin abnormality known as acanthosis nigricans, which involves a discoloration (hyperpigmentation) and “velvety” thickening (hyperkeratosis) of the skin around skin fold regions of the neck, groin and under arms is also a common symptom. Symptoms will negatively impact the daily life of the patient, and will persist until treated.
Minor symptoms may include an enlargement of the genitalia and precocious puberty and a deficiency or absence of fat tissue. Because individuals with Rabson–Mendenhall syndrome fail to use insulin properly, they may experience abnormally high blood sugar levels (hyperglycemia) after eating a meal, and abnormally low blood sugar levels (hypoglycemia) when not eating.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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