Translation

良性の / 非がん性の / 害のない

Meaning

In medicine, benign means not cancerous and unlikely to spread to other parts of the body. A benign tumor still may need monitoring or treatment, but it is not malignant. Outside medicine, benign means not harmful or gentle.

Examples

• 検査の結果、そのしこりは良性だと分かりました。
  The test showed that the lump was benign.
• 医師はその良性腫瘍を経過観察することにしました。
  The doctor decided to monitor the benign tumor.