原げん発ぱつ巣そう

noun

primary lesion

Medical term for the original site of a disease, especially cancer, from which metastasis may occur. Often contrasted with 転移巣 (metastatic lesion).

See also: 転移巣

• 医い師しは原げん発ぱつ巣そうの切せつ除じょを勧すすめた。

  The doctor recommended removal of the primary lesion.

• 転てん移いが見みつかったが、原げん発ぱつ巣そうはまだ特とく定ていされていない。

  Metastasis was found, but the primary lesion has not yet been identified.