良性

1. Origins, structure, and basic meaning

• Structure: In medical language, 良性 (りょうせい) describes a lesion or tumor as benign rather than malignant.
• Basic usage: It appears in classifications such as 良性と悪性 and as a predicate in 良性だ when reporting a result.

2. Common pitfalls and similar expressions

• Contrast with malignancy
  • In medical context, benign does not simply mean good, nor does it mean a positive test result.