Snapshot A 35-year-old man presents to his primary care physician after noticing a mass in his mid-abdomen. He denies any recent trauma to the abdomen, nausea, vomiting, or changes in his bowel habits. He says that the mass is not painful but causes mild abdominal disomfort. His father had "colon polyps" that required prophylactic removal of his colon. On physical examination, there is a firm and oblong mass in the epigastric region that is not painful to palpation. An MRI of the abdomen demonstrates an intraabdominal mass. He undergoes surgical removal, and pathology demonstrates spindle cells with abundant fibrous stroma that is concerning for a desmoid tumor. Introduction Overview login to view 2 more bullets Epidemiology Incidence login to view 1 more bullet Location login to view 4 more bullets Risk factors login to view 4 more bullets ETIOLOGY Pathophysiology login to view 2 more bullets Genetics login to view 2 more bullets Associated conditions login to view 3 more bullets Presentation Symptoms login to view 6 more bullets Physical exam login to view 4 more bullets Imaging Cross-sectional imaging with CT or MRI login to view 4 more bullets Studies Invasive studies login to view 6 more bullets Differential Keloids login to view 3 more bullets Treatment Nonoperative login to view 8 more bullets Operative login to view 3 more bullets Complications Death login to view 1 more bullet Prognosis Natural history of disease login to view 1 more bullet Prognostic variable login to view 3 more bullets