keratoacanthoma

keratoacanthoma
A rapidly growing tumor that may be umbilicated, and usually occurs on exposed areas of the skin in elderly white men, which invades the dermis but remains localized and usually resolves spontaneously if untreated; microscopically, the nodule is composed of well-differentiated squamous epithelium with a central keratin mass that opens on the skin surface. [kerato- + G. akantha, thorn, +-oma, tumor]

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ker·a·to·ac·an·tho·ma .ker-ət-ō-.ak-.an-'thō-mə n, pl -mas also -ma·ta -mət-ə a rapidly growing skin tumor that occurs esp. in elderly individuals, resembles a carcinoma of squamous epithelial cells but does not spread, and tends to heal spontaneously with some scarring if left untreated

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n.
a firm nodule that appears singly on the skin, grows to 1-2 cm across in about six weeks, and usually disappears gradually during the next few months. Men are affected more often than women, commonly between the ages of 50 and 70. Keratoacanthomas occur mainly on the face; the cause is not known. Spontaneous healing may leave an unsightly scar; therefore treatment by curettage and cautery, or excision, may be required.

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ker·a·to·ac·an·tho·ma (ker″ə-to-ak″an-thoґmə) [kerato- + acanthoma] a locally destructive epithelial tumor with a superficial crater containing a keratin plug; it closely resembles squamous cell carcinoma clinically and histologically, but is benign and generally undergoes spontaneous regression. Exposure to sunlight is believed to play a role in its etiology.

Medical dictionary. 2011.

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  • keratoacanthoma — noun A common low grade malignancy of the skin …   Wiktionary

  • keratoacanthoma — n. a firm nodule that appears singly on the skin, grows to 1–2 cm across in about six weeks, and usually disappears gradually during the next few months. Men are affected more often than women, commonly between the ages of 50 and 70.… …   The new mediacal dictionary

  • keratoacanthoma — noun skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar • Hypernyms: ↑acanthoma, ↑skin tumor …   Useful english dictionary

  • eruptive keratoacanthoma — a manifestation of keratoacanthoma, seen usually in light skinned, middle aged adults, consisting of a generalized papular eruption of dome shaped, skin colored papules, often sparing the palms and soles …   Medical dictionary

  • giant keratoacanthoma — a solitary keratoacanthoma more than 2 cm in diameter …   Medical dictionary

  • multiple keratoacanthoma — a condition almost identical to solitary keratoacanthoma except that it preferentially affects adolescents and young adults and occurs even on areas of skin unexposed to sunlight. See also self healing squamous epithelioma, under epithelioma …   Medical dictionary

  • solitary keratoacanthoma — a manifestation of keratoacanthoma seen primarily in middle aged to elderly persons, especially white males, consisting of a firm, erythematous papule that enlarges rapidly to form a dome shaped, skin colored nodule with an umbilicated center,… …   Medical dictionary

  • Кератоакантома (Keratoacanthoma) — твердый единичный узелок, появляющийся на коже и вырастающий до 1 2 см в течение шести недель; далее на протяжении следующих нескольких месяцев он обычно постепенно проходит. У мужчин появление кератоакантом встречается чаще, чем у женщин, причем …   Медицинские термины

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