CTICasesDesmoid Tumor (Fibromatosis) of the Chest Wall
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Imaging findings
Imaging reveals an infiltrating soft tissue mass in the supraclavicular region, demonstrating subtle enhancement and proximity to the subclavian vessels and brachial plexus. On chest radiograph, the clavicular companion shadow on the affected side is effaced. MRI further delineates the infiltrating nature of the mass.
Key takeaways
Desmoid tumors, also known as fibromatosis, are locally aggressive but non-metastatic soft tissue tumors. They have a high propensity for local recurrence and can infiltrate surrounding structures, such as the brachial plexus and subclavian vessels, causing compression symptoms. While not technically malignant, their aggressive local behavior necessitates wide surgical resection. On radiography, they can subtly efface the clavicular companion shadow. The differential diagnosis includes other soft tissue neoplasms like sarcomas or lymphomas.
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