Thymoma by Masaoka-Koga Stage

**Semantic type:** Neoplastic Process

**Definition:** A staging system for thymoma based on the anatomic extent of disease at the time of surgery.

**Synonyms:** - Masaoka Staging - Masaoka Staging System - Masaoka Staging System for Thymoma - Masaoka-Koga Staging System for Thymoma