| ichthyosis | <dermatology> A group of cutaneous disorders characterised by increased or aberrant keratinisation, resulting in noninflammatory scaling of the skin. Many different metaphors have been used to describe the appearance and texture of the skin in the various types and stages of ichthyosis, for example alligator, collodion, crocodile, fish and porcupine skin. most ichthyoses are genetically determined, while some may be acquired and develop in association with various systemic diseases or be a prominent feature in certain genetic syndromes. The term is commonly used alone to refer to i. Vulgaris. (18 Nov 1997) |
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| ichthyosis congenita neonatorum | Generalised ichthyosis with parchment-like skin seen in premature babies. (05 Mar 2000) |
| ichthyosis corneae | An ocular complication of a congenital abnormality of the skin with corneal keratinization, dryness, and scaling. (05 Mar 2000) |
| ichthyosis foetalis | Recessive condition in Holstein and Norwegian red poll cattle resembling harlequin foetus in humans. See: harlequin foetus (05 Mar 2000) |
| ichthyosis follicularis | A form of autosomal dominant type of ichthyosis, with horny follicular plugging of the extensor surfaces of the extremities; onset in early childhood. (05 Mar 2000) |
| ichthyosis hystrix | See: bullous congenital ichthyosiform erythroderma Origin: G. Hystrix, hedgehog (05 Mar 2000) |
| ichthyosis intrauterina | most common form of ichthyosis characterised by prominent scaling especially on the exterior surfaces of the extremities. It is inherited as an autosomal dominant trait. (12 Dec 1998) |
| ichthyosis linearis circumflexa | Congenital or infantile migratory polycyclic erythema and scaling that shows a peripheral double margin; persists throughout life and may be associated with trichorrhexis invaginata in Netherton's syndrome; autosomal recessive inheritance. (05 Mar 2000) |
| ichthyosis palmaris et plantaris | The occurrence of symmetrical diffuse or patchy areas of hypertrophy of the horny layer of the epidermis on the palms and soles; a group of ectodermal dysplasias of considerable variety, and either autosomal dominant or recessive inheritance. Synonym: ichthyosis palmaris et plantaris, keratoderma palmaris et plantaris, keratoderma symmetrica, keratoma plantare sulcatum, keratosis palmaris et plantaris, tylosis palmaris et plantaris. (05 Mar 2000) |
| ichthyosis scutulata | Ichthyosis marked by diamond-shaped or shield-shaped lesions. (05 Mar 2000) |
| ichthyosis sebacea | The presence of an unusual amount of vernix caseosa. (05 Mar 2000) |
| ichthyosis sebacea cornea | A type of ichthyosis with vernix caseosa as seen in the newborn. (05 Mar 2000) |
| ichthyosis simplex | most common form of ichthyosis characterised by prominent scaling especially on the exterior surfaces of the extremities. It is inherited as an autosomal dominant trait. (12 Dec 1998) |
| ichthyosis spinosa | A genodermatosis characterised by diffuse chronic erythema and scale formation which may be separated into bullous and nonbullous forms. Synonym: ichthyosiform erythroderma, ichthyosis spinosa, keratoma malignum. (05 Mar 2000) |
| ichthyosis uteri | Transformation of the columnar epithelium of the endometrium into stratified squamous epithelium. (05 Mar 2000) |
| acquired ichthyosis | A thickening and scaling of the skin associated with some malignant diseases (e.g., Hodgkin's disease, lymphosarcoma), leprosy, and severe nutritional deficiencies. (05 Mar 2000) |
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| harlequin ichthyosis | Foetal form of ichthyosis distinct from lamellar ichthyosis in its patchy character and the poor prospect of the patient surviving the neonatal period. (05 Mar 2000) |
| X-linked ichthyosis | A form of ichthyosis, due to 3-beta-hydroxysteroidsulfate sulfatase deficiency, that appears at birth or in early infancy and affects males; characterised by scaling predominantly on the neck and trunk but not on the palms and soles; histologically, there is hyperkeratosis, a granular layer in the epidermis, and normal epidermal cell turnover. Synonym: steroid sulfatase deficiency. (05 Mar 2000) |
| nacreous ichthyosis | A variant of ichthyosis characterised by dry pearly scales. (05 Mar 2000) |
| lamellar ichthyosis | A dry form of congenital ichthyosiform erythroderma, an autosomal recessive trait present at birth; characterised by large, coarse scales over most of the body with thickened palms and soles, and associated with ectropion; histologically, there is hyperkeratosis, a prominent granular layer in the epidermis, slight acanthosis, many mitotic figures, and normal or reduced epidermal cell turnover. See: collodion baby, harlequin foetus. (05 Mar 2000) |