Bilateral nevus of Ota: a rare manifestation congenital type in a boy.

BACKGROUND: The nevus of Ota is usually characterized by small, flat, unilateral, blue-black or gray-brown spots occurring on skin innervated by the first or second branch of the trigeminal nerve. It comprises dermal melanocytes, presumably arising due to the dermal arrest of cells migrating from the neural crest. Nevus of Ota is 3-5 times more common in women than men, and is classified into congenital type, appearing soon after birth, and acquired type, appearing during or after puberty. METHODS: We report on a six-year-old Japanese boy with the bilateral nevus of Ota. He was referred to our hospital because of bilateral hyperpigmentation of the face, present since birth. Our treatment consisted of Q-switched ruby laser irradiation under general anesthesia. The Q-switched ruby laser (Model IB101; Niic Co. Ltd., Tokyo, Japan), had a wavelength of 694.3 nm, a spot size of 5 mm, a 1 Hz repetition rate, a pulse duration of 20 nsec and fluence ranged from 3.0 J/cm2 to 6.0 J/cm2. RESULTS: Q-switched ruby laser irradiation improved his pigmentation, and will therefore be repeated several times. CONCLUSIONS: This case of congenital bilateral nevus of Ota in a young male patient was very rare. And Q-switched ruby laser irradiation was effective as same as another nevus of Ota.

Report of rare palatal expression of Nevus of Ota with amendment of Tanino's classification.

Nevus of Ota, a benign melanocytic pigmentary disorder with rare malignant transformation potential, affects 0.014-0.034% of the Asian and Black population and has a strong predilection for females. It occurs in the area innervated by the first and second division of the trigeminal nerve. Oral manifestation is rarely noted with only 14 cases reported till date. This report documents a case of Nevus of Ota with the infrequently noted oral involvement, in an Indian lady. Since oral manifestation is not acknowledged in Tanino's classification, the authors propose a modification to the same.

[Ocular melanocytosis and delayed psycho-intellectual development--other association?]. / Melanocitoza oculara congenitala si întârziere în dezvolarea psihointelectuala--o alta asociere?

Congenital ocular melanocytosis (COM) is an extremely rare melanocytic hyperplasia (0.038% in Caucasian population); it affects episclera and sclera. The conjunctival epithelium is not affected, as opposed to conjunctival melanosis. The pigmentation is grayish-blue and its consistency with the underlying tissues as the conjunctiva moves (deep pigmentation) is an essential diagnostic clue. COM may be isolated or associated with facial pigmentation, in the area innervated by the trigeminal nerve--known as oculodermal melanocytosis or nevus of Ota. COM may associate the following findings: iris hypercromia, iris mammillations, fundus hypercromia, uveal melanoma (most frequent choroidal melanoma) and glaucoma (10%). Melanocytes have been found in the brain, orbit, bucal mucosa in COM.

Nevus pigmentovascularis.

We describe a rare case of nevus pigmentovascularis, consisting of disseminated nevus spilus, mongolian-spot-like maculae, port-wine stains, bilateral nevus of Ota, and cavernous hemangioma. Although nevus pigmentovascularis is generally recognized as a congenital disease in Japan, we were unable to find a similar presentation of it in English textbooks on dermatology and plastic surgery.

Diffuse iris nevus in oculodermal melanocytosis: a light and electron microscopic study.

We studied by light and electron microscopy the diffuse iris nevus of an eye in a 16-year-old patient with oculodermal melanocytosis and choroidal malignant melanoma. The nevus cells in the anterior border layer of the iris appeared to be poorly differentiated, showing moderate infolding of the nuclear membrane with heterochromatin clumping, watery cytoplasm, abundant mitochondria, fine filaments, rough endoplasmic reticulum, and numerous pinocytotic vesicles. Small scattered immature melanosomes and occasional giant melanosomes were observed in these cells. Deep in the iris stroma, however, nevus cells were found singly or in small groups, and were associated with an increasing number of melanized melanosomes and cytoplasmic filaments and reduced numbers of other cytoplasmic organelles, such as mitochondria and free ribosomes. Differentiation of the iris nevus cells appeared to progress from the anterior border layer toward the iris stroma. This observation suggests that intrastromal nevi may be more benign than nevi with surface plaque. The ultrastructural characteristics of the diffuse nevi of oculodermal melanocytosis were compared with those of other iris nevi.