melanosis (redirected from congenital melanosis)

melanosis /mel·a·no·sis/ (mel″ah-no´sis) melanism; disordered production of melanin, with darkening of the skin.

---

melanosis co´li  black or dark brown discoloration of the mucosa of the colon, due to the presence of pigment-laden (not true melanin) macrophages within the lamina propria.

neurocutaneous melanosis  giant hairy nevus accompanied by malignant melanomas of the meninges.

---

mel·a·no·sis (ml-nss)

n.

Abnormally dark pigmentation of the skin or other tissues, resulting from a disorder of pigment metabolism. Also called melanism.

---

mela·notic (-ntk) adj.

---

melanosis.

See melanism.

---

melanosis (mel´nō´sis),

n the condition in which melanin pigments appear in the tissues. Melanosis is normal in the gingivae of most dark-skinned individuals and occasionally in those with light skin.

---

melanosis

1. a condition characterized by dark pigmentary deposits.

2. a disorder of pigment metabolism.

---

melanosis coli

brown-black discoloration of the mucosa of the colon.

congenital melanosis

patches of melanin in the capsule and stroma of the liver or lung in the neonate.

liver melanosis

see hepatic lipofuscinosis.

---

melanosis

An abnormal accumulation of melanin pigment in the skin or other tissues. If there is a larger quantity than normal of pigment in the tissues of the eye, the condition is referred to as melanosis bulbi (melanosis oculi) or primary acquired melanosis when on the conjunctival epithelium and limbus. It may extend onto the peripheral cornea. It may be benign or become malignant, in which case nodules appear and excision or cryotherapy is required. See naevus of Ota.