Premium
CORNEOCYTES IN SCALY PARAKERATOTIC DISEASES
Author(s) -
AMER MOHAMED,
MOSTAFA FAWZIA FARAG,
TOSSON ZENAB,
NASR AWATIF NAGIB
Publication year - 1996
Publication title -
international journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 93
eISSN - 1365-4632
pISSN - 0011-9059
DOI - 10.1111/j.1365-4362.1996.tb03024.x
Subject(s) - corneocyte , pityriasis rubra pilaris , parakeratosis , seborrheic dermatitis , pityriasis rosea , psoriasis , dyskeratosis , medicine , dermatology , pathology , stratum corneum , biopsy , hyperkeratosis
Background and Objectives. The stratum corneum of some of the scaly (parakeratotic) diseases was examined with light and scanning electron microscopy (SEM) with the purpose to reveal the importance of this layer in the diagnosis of some of the diseases associated with the formation of scales. Materials and Methods. Two biopsies of the skin surface were taken: one, obtained from 80 patients with various parakeratotic scaly diseases and from 25 control subjects, was processed for light microscopy; the other biopsy for SEM was taken from 10 control subjects and 25 patients. The diagnoses of these patients were: psoriasis (5 patients), erythrodermic psoriasis (2 subjects), parapsoriasis (5 patients), pityriasis rubra pilaris (5 subjects), pityriasis rosea (3 subjects), and seborrheic dermatitis (5 subjects). Results. The light microscopic studies showed that normal corneocytes are of polygonal shape with their largest diameter measuring 42 μm; these cells lacked nuclei. All parakeratotic cells appeared bizarre in shape, smaller than normal, and the cells contained a nucleus. With SEM, normal cells appeared relatively regular in size and shape, trabeculated, and had a flat surface. Cells examined in all the diseases revealed various sizes, outlines, and trabeculae. Specific surface patterns (print) of diseased cells were: “fish‐scale” in psoriasis; “marbled” in parapsoriasis, “rocky stone” in pityriasis rubra pilaris; “heart‐shaped” in seborrheic dermatitis, and semi‐crystalloid in pityriasis rosea. Conclusions. Parakeratosis is characterized not only by the retention of the nucleus in keratinocytes, but is also characterized by a cell of smaller size. The specific print of a disease helps in the diagnosis. The print will change with different stages of a disease.