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Acanthosis nigricans. Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [2] such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas. [1]
Acantholysis is the loss of intercellular connections, such as desmosomes, resulting in loss of cohesion between keratinocytes, [1] seen in diseases such as pemphigus vulgaris. [2] It is absent in bullous pemphigoid, making it useful for differential diagnosis . This histological feature is also seen in herpes simplex infections (HSV 1 and 2 ...
Donohue syndrome (also known as leprechaunism) is an extremely rare and severe genetic disorder. Leprechaunism derives its name from the hallmark elvish features (small stature, bulging eyes, thick lips, and upturned nostrils) exhibited by the affected individuals. The disease is caused by a mutation in the INSR gene, which contains the genetic ...
Periorbital hyperpigmentation, also known as hereditary dark circles, is characterized by darker skin around the eyes caused by the presence of additional melanin. It is an extremely common hereditary human characteristic and is frequently found on individuals with dark skin. Periorbital hyperpigmentation is most prevalent within the 16–25 ...
People with Crouzonodermoskeletal syndrome have acanthosis nigricans, a skin condition characterized by thick, dark, velvety skin in body folds and creases, including the neck and underarms. In addition, subtle changes may be seen in the bones of the spine ( vertebrae ). Noncancerous growths called cementomas may develop in the jaw during young ...
very rare, only 2 cases known to medical literature. Acanthosis nigricans-muscle cramps-acral enlargement syndrome, also known as Acanthosis nigricans-insulin resistance-muscle cramps-acral enlargement syndrome is an extremely rare genetic disorder which is characterized by the appearance of acanthosis nigricans, insulin resistance, muscle ...
The HAIR-AN syndrome is a rare subtype of polycystic ovary syndrome (PCOS) characterized by hyperandrogenism (HA), insulin resistance (IR) and acanthosis nigricans (AN). The symptoms of the HAIR-AN syndrome are largely due to severe insulin resistance, which can be secondary to blocking antibodies against the insulin receptor or genetically absent/reduced insulin receptor number/function.
Addison's disease, also known as primary adrenal insufficiency, [4] is a rare long-term endocrine disorder characterized by inadequate production of the steroid hormones cortisol and aldosterone by the two outer layers of the cells of the adrenal glands ( adrenal cortex ), causing adrenal insufficiency. [5] [6] Symptoms generally come on slowly ...
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