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SEER Inquiry System - Report
Produced: 09/13/2025 2:27 PM
Question 20150052
Inquiry Details
References:
WHO Class Soft Tissue & Bone, 232. 2013
Question:
Primary Site--Sarcoma: What is the best primary site code for an undifferentiated sarcoma of the pulmonary artery? See discussion.
Discussion:
Consolidation of the case: The operating hospital stated: SOFT TISSUE: Resection: Procedure: Radical resection Other: Pneumonectomy Tumor Site: Right pulmonary artery - They used code C383 (mediastinum NOS). The consulting hospital stated: Lung, right, pneumonectomy: High grade sarcoma consistent with intimal sarcoma; tumor involves pulmonary artery. They used code C449 (other soft tissue NOS). Would C493 (soft tissue thorax) be correct?
Answer:
Code the primary site to pulmonary artery, C493. According to the WHO classification of tumors, intimal sarcomas are malignant mesenchymal tumors arising in large blood vessels. They show mostly intraluminal growth with obstruction of the vessel. They may occur in the pulmonary vessels or, less often, in the aorta.
