Desmoid tumor, intrathoracic

This code describes a desmoid tumor, a rare, locally aggressive, non-metastasizing soft tissue tumor, specifically located within the thoracic cavity. These tumors arise from musculoaponeurotic structures and can infiltrate surrounding tissues, potentially causing significant morbidity due to their location.

Use this code when documentation clearly indicates a diagnosis of a desmoid tumor confirmed to be situated within the chest, such as in the pleura, mediastinum, or chest wall. This diagnosis is typically established through imaging (e.g., CT, MRI) and biopsy.

• Ensure the documentation specifies "intrathoracic" to differentiate from desmoid tumors in other anatomical sites.
• Do not confuse with malignant soft tissue tumors; desmoid tumors are benign but locally aggressive.
• Consider sequencing this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.