Translation

悪性の / がん性の / 有害な

Meaning

In medicine, malignant means cancerous and likely to grow, invade nearby tissue, or spread to other parts of the body. It signals serious risk and usually needs prompt medical evaluation. The opposite medical word is benign.

Examples

• 病理検査でその腫瘍は悪性だと確認されました。
  Pathology confirmed that the tumor was malignant.
• 悪性細胞がリンパ節に見つかりました。
  Malignant cells were found in the lymph nodes.