病巣

1. Origins, structure, and basic meaning

• Structure: 病巣, read びょうそう, is a noun for a lesion or focus of disease and can figuratively denote a source of trouble.
• Basic usage: Medical context uses patterns such as 肺の病巣, while figurative context can use 不正の病巣.

2. Common pitfalls and similar expressions

• Literal lesion and metaphor
  • A site found on a scan is literal, whereas corruption in an organization is treated metaphorically as a diseased focus.
• Problem versus its source
  • Figurative 病巣 focuses on the harmful seat from which a problem persists, rather than merely naming every visible symptom.