Melanosis


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Melanosis

 

the intensified formation and deposit in organs and tissues of a dark brown or black pigment of the melanin group (normally present in the skin, retina, and meninges).

A distinction is made between congenital melanosis and acquired melanosis. The former includes congenital melanosis of the skin (melanoderma), manifested by freckles or pigmented birthmarks. Acquired melanosis frequently develops as a result of a change in endocrine function (adrenal, pituitary, or gonadal). The pigmentation may be diffuse (for example, in Addison’s disease) or circumscribed (for example, during pregnancy, on the face and around the nipples). The condition may also be caused by systemic poisoning by hydrocarbons (toxic melanoderma) or by physical, mechanical, or chemical irritation (light, heat, the distillate products of coal).

References in periodicals archive ?
Melanosis coli (pseudomelanosis or lipofuscinosis coli) partly endogenous and exogenous from laxatives Black thyroid (also minocycline deposition) Age-related macular degeneration Some Leydig cell tumors;other tumors?
Glutathione as a whitening agent in the treatment of melanosis of the face.
Neurocutaneous melanosis, a complication of giant congenital nevi, is a melanocyte proliferation in the central nervous system (CNS).
Las diferencias observadas en las frecuencias de las dermatosis: en grupo racial, la mancha mongolica, la hiperpigmentacion genital, la hipertricosis, el callo de succion labial (en lactancia materna) y la melanosis pustulosa neonatal transitoria son mas frecuentes en poblacion indigena; en los mestizos predominan el quiste palatino, la mancha salmon, y el eritema toxico neonatal, aunque en las dos ultimas quizas se deba unicamente a una mayor dificultad de detectar el eritema en las pieles oscuras.
En peces, la melanosis ha sido reportada en pocas especies (Tabla 1), lo que indica que no es un aspecto comun y que afecta con mas frecuencia a especies limnicas.
Tambien esta la melanosis del fumador, que consiste en pigmentaciones maculares de la mucosa oral, parduzcas y de forma irregular, asociadas a tabaquismo prolongado.
Entre los principales signos clinicos observados en los peces se encontraron melanosis (24.
3,4) Differential diagnosis includes other causes of black colored esophagus with melanosis, pseudomelanosis, malignant melanoma and acanthosis nigricans.
Inhibition effects of grape seed extracts on melanosis formation in shrimp (Parapenaeus longirostris).
The current case demonstrates the classic features of minocycline-induced black thyroid syndrome (MIBT), sometimes known as a Melanosis thyroidii.
Differential diagnoses of PMP include peritoneal carcinomatosis, lymphomatosis, sarcomatosis, infectious peritonitis, inflammatory pseudotumour, gliomatosis peritonei, peritoneal hydatidosis and peritoneal melanosis.