A nodule or mass resulting from displacement of tissue when atavism occurs in embryonic development; represents a reversion to structures not normally occurring in the individuals of a species, but observed in ancestral forms of that species. [pro- + G. gonos, offspring, + -oma, tumor]
- p. of jaw SYN: melanotic neuroectodermal tumor of infancy.

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pro·go·no·ma (pro″go-noґmə) [pro- + gon- + -oma] a tumor due to misplacement of tissue as the result of fetal atavism to a stage that does not occur in the life history of the species but does occur in ancestral forms of the species.

Medical dictionary. 2011.

Look at other dictionaries:

  • melanotic progonoma — melanotic neuroectodermal tumor …   Medical dictionary

  • прогонома меланотическая — (progonoma melanoticum; греч. progonos рожденный раньше + ома) см. Меланоамелобластома …   Большой медицинский словарь

  • Прогоно́ма меланоти́ческая — (progonoma melanoticum; греч. progonos рожденный раньше + ома) см. Меланоамелобластома …   Медицинская энциклопедия

  • tumor — 1. Any swelling or tumefaction. 2. SYN: neoplasm. 3. One of the four signs of inflammation (t., calor, dolor, rubor) enunciated by Celsus. [L. t., a swelling] acinar cell t. a …   Medical dictionary

  • melanotic neuroectodermal tumor — a benign, rapidly growing, deeply pigmented tumor of the jaw or occasionally other sites, consisting of an infiltrating mass of cells arranged in an alveolar pattern, and occurring almost exclusively in infants. Its source of origin is in dispute …   Medical dictionary

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