No abstract available.
Epidermis* ; Psoriasis

Authors performed the immunohistochemical study with avidin biotin-peroxi- dase complex staining on the nail unit of the human fetus for determining the presence of keratin and prekeratin. Seven fetuses, ranging from 12 to 27 weeks in age, were examined. In all cases, the keratin and prekeratin were found in the epidermis of nail units, but not found in stratum corneum and nail plate. Keratin was located predominantly in suprabasal cells whereas prekeratin was located diffusely in the epidermis. Interestingly keratin and prekeratin were found as early as 12 week-old gestational period. There was no significant difference in presence of keratin and prekeratin.
Avidin ; Epidermis ; Fetus ; Humans*

Superficial epithelioma with sebaceous differentiation is a rare-benign neoplasm, which is characterized by a superficial plate-like proliferation of basaloid to squamoid cells with broad attachments to the overlying epidermis. Herein, we describe a male patient with superficial epithelioma with sebaceous differentiation.
Carcinoma* ; Epidermis ; Humans ; Male

No abstract available.
Epidermis* ; Urocanic Acid*

The epidermis, which is composed mainly of keratinocyt;es, undergoes continual proliferation and differentiation, To study keratinocyte differentiation, it is necessary to separate the keratinocytes at their sucessive stages of maturation. We separate the keratinocytes by layers by using Percoll and obtain the relatively pure fractions of basal cells, spinous cells, and granular cells, 76. 8%, 67. 2%, 30%. respectively.
Epidermis ; Humans* ; Keratinocytes

No abstract available.
Epidermis* ; Peptides* ; Water*

Pigmented lesions of palmar and plantar skin may cause diagnostic problems, because some features of benign lesions in these sites may raise the suspicion of melanoma if considered alone. Transepidermal elimlnation is a mechanism by which a substance is eliminated through the epidermis, and it is apt to be confused with a feature of melanoma that tumor cells are located at all layers of the epidermis. We report a case of transepidermal elimination of nevus cells in acral letiginous nevus which needs a differential dignosis of melanoma.
Epidermis ; Melanoma ; Nevus* ; Skin

No abstract available.
Epidermis* ; Skin Diseases* ; Skin*

Superficial epithelioma with sebaceous differentiation (SESD) is a rare benign neoplasm with peculiar histopathologic characteristics. It is characterized by a superficial plate-like proliferation of basaloid to squamoid cells with broad attachments to the overlying epidermis. Keratin-filled cysts and clusters of sebaceous cells are present within the lobules. We herein report an additional case of SESD which developed on a 68-year-old female.
Aged ; Carcinoma ; Epidermis ; Female ; Humans

We report herein a case of acquired periungual fibrokeratoma occuring beneath the proximal nail fold. A 0.5 X 0.3 cm sized, firm nodule was found beneath the proximal nail fold and at its distal portion longitudinal ridging of nail plate was found. Histopathological finding showed marked hyperkeratosis and acanthosis in the epidermis and thick collagen bundles were predominantly oriented in the direction of longitudinal axis of the tumor.
Axis, Cervical Vertebra ; Collagen ; Epidermis