認知症

1. Origins, structure, and basic meaning

• Structure: 認知症 (にんちしょう) is the medical noun dementia.
• Basic usage: 認知症について学ぶ makes the condition a study topic; 認知症の祖父 describes a grandfather living with it.

2. Common pitfalls and similar expressions

• Condition as topic and modifier
  • について introduces information about the condition, while の connects it to a person without equating the person with the diagnosis.