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 ?
No treatment is required for racial melanosis, as this is a benign condition with no tendency to undergo malignant transformation.
Laryngeal melanosis is defined as the presence of ectopic melanocytes within the epithelial lining of the larynx.
double dagger]) Melanosis coli was found on rectal biopsy in the three patients taking anthraquinones.
Venous Congestion in Eye, Branch Vein Occlusion, Ocular Melanosis, Retinal Telangiectasias, Venous Stasis Retinopathy, Amourosis Fugax, Retina Vein Occlusion, Sudiferous cysts of lids.
Gamma-and delta-tocotrienols inhibit cutaneous melanosis (hallmark of melanoma) by suppressing constitutive and UV-induced tyrosinase activation.
00 (Hydrogenated polydecene) Phase D Crcastai Melanosis Silver WL 80 (Coast Southwest
Basic Reactions of the Body to Irritation" According to Horner's (4) A Treatise on Pathological Anatomy Reactions Variants Inflammation Acute or phlegmasia, chronic (tubercle, ossification, delitescence), resolution, abscess, ulceration, induration (scirrhus), gangrene, sub-inflammation, cancer, pseudo-membranes, erythemoid, mollescence, fungiform or granulated, follicular or pustular, hepatization Hemorrhage None described Nervous No findings Secretory None described Nutritive Obesity, hypertrophy Tissue transformation Into fibrous, cartilaginous, bony, etc Nonclassified Melanosis, engorgement, hypertrophy, atrophy, morbid degeneration, dilatation, polyp
Which of the following statements about racial melanosis is FALsE?
The present situation is that several thousands of people of Bangladesh are suffering from arsenic effects ranging from melanosis to cancer and millions more exposed to arsenic through drinking arsenic-contaminated groundwater.
The differential diagnosis includes: MRI sequence artifact seen on some but not all sequences, normal or abnormal surface veins, neurocutaneous melanosis or meningioangiomatosis.
Histological, immunological and molecular features of a nasal mucosa primary melanoma associated with nasal melanosis.