Introduction: Desmoid-type fibromatosis (DTF) is a slow-growing locally infiltrative fibrous tumor. It constitutes 0.03% of all neoplasms. Most of the DTF occur in the abdominal wall. DTF of chest wall is a rare extra-abdominal fibromatosis (8-10% of all cases).
Case presentation: We report a case of 41 year-old female with DTF of the right chest wall who had a history of an excisional biopsy of the right breast mass three years ago. She presented with a lump in the right chest wall mimicking breast lesion around the line of the previous excision. Mammography findings were reported as BIRADS-4, suspicious for breast carcinoma. But, the excisional biopsy was diagnosed as DTF histopathologically.
Conclusion: DTF is a rare locally aggressive tumor that may mimic malignancy due to its clinical, radiological and histopathological findings. Although the etiology of DTF is not clear, most of the cases with DTF have a history of trauma or operation similar to our case. Thus, it is noteworthy that a comprehensive clinical history will contribute the accurate diagnosis of DTF.
Breast, chest wall, desmoid, fibromatosis.