Two out of 60 conjunctival epithelial tumours reviewed between 1973 and 1989 were found to be pigmented. One tumour was a pigmented papilloma and the other a pigmented squamous cell carcinoma. The melanin pigment was found in epithelial tumour cells as well as in macrophages, dendritic melanocytes, and Langerhans cells. The distinction between the latter two types of cells was possible in one o...

Langerhans' cells were observed to migrate into chemically injured corneal epithelium of pigmented and albino guinea pigs in substantial numbers. Whereas the migration of Langerhans' cells was a regular occurrence in both pigmented and nonpigmented animals, the migration of melanocytes occurred in only a portion of the pigmented animals and in fewer numbers. These observations may have signific...

Pigmented lesions are commonly found in the mouth. Such lesions represent a variety of clinical entities, ranging from physiologic changes to manifestations of systemic illnesses and malignant neoplasms. Evaluation of a patient presenting with a pigmented lesion should include a full medical and dental history, extraoral and intraoral examinations and, in some cases, biopsy and laboratory inves...

Pigmented Bowen's disease is rare, though more prevalent in men. It presents as a well-delineated plaque in areas unexposed to sun. There are reports of association with seborrheic keratosis, solar lentigo or exuberant pigmentation of genital and intertriginous regions. A specific dermoscopy finding is the presence of brown or gray dots in regular arrangement and coiled or dotted vessels. Thus,...

The incidence of malignant melanoma is increasing every year. Revealing melanoma in situ on time is increasing good prognosis of these patients. To evaluate the role of digital epiluminescence microscopy (DELM) in the differential diagnosis of cutaneous pigmented lesions and to improve the early diagnosis of melanoma in situ, 8384 pigmented lesions from 3927 consecutive patients were evaluated ...

Biofilters are key components in recirculating aquaculture systems (RAS). For ensuring cost-efficient function of biofilters, characteristics biocarriers such as shape, material, surface area, density, longevity, and price needs to be evaluated. In this study, we compared otherwise identical made polyethylene (PE) against ones polypropylene (PP) PP with three different levels pigment (carbon bl...

PURPOSE To compare emmetropization in albino and pigmented guinea pigs. METHODS Distributions of refractive state were examined in 214 albino and 234 pigmented guinea pigs. Albino (A) and pigmented (P) guinea pigs were divided into two groups, hyperopic (H) and myopic (M). Eye development was separately followed in 10 randomly selected animals from each group (AH, AM, PH, PM) from 2 to 10 wee...

Pigmented neurofibroma is a rare variant of neurofibroma showing melanin production. The clinical diagnosis is difficult to establish requiring the histopathological examination to differentiate between the melanotic neurofibroma and other pigmented tumours. We report an unusual case of a huge, recurrent, pigmented neurofibroma with extended, macroscopically striking pigmentation in a 45 year o...