- Benign, noninflammatory fibroblastic tumors with a tendency to local invasion and recurrence but without metastasis.
- Desmoid tumors are frequently associated with previous trauma or surgical incision, which may be an important etiological factor.
- Some cases have been associated with estrogen therapy.
- Rare lesions with an estimated incidence of 3 or 4 new cases per million population per year.
- Occur in all age groups but predominantly during the 3rd and 4th decade.
- Frequent locations in the abdomen are the abdominal wall, the root of the mesentery and the retroperitoneum.
- Mesenteric desmoid occurs spontaneously or in association with familial polyposis coli syndrome.
 Imaging Findings
- Homogeneously anechoic or hypoechoic masses.
- Most are well circumscribed masses but in a minority of patients they are ill-defined with unsharp borders.
- Most are relatively homogeneously or focally hyperattenuating as compared to soft tissue on the precontrast scan.
- Most desmoids will clearly enhance following intravenous contrast medium
- Typically show a low intensity signal on both T1-weighted and T2-weighted scans.