Thymus Tumor pT1a TNM Finding v9

**Semantic type:** Finding

**Definition:** Thymus tumor measuring 5 cm or less in greatest dimension with either: limited to the thymus with or without encapsulation; directly invades into the mediastinal fat only; directly invades the mediastinal pleura but does not involve any other mediastinal structure. (from AJCC 9th Ed.)

**Synonyms:** - Thymic Tumor pT1a TNM Finding v9