Where do desmoid tumors grow?

Desmoid tumors are often found in the abdomen, as well as the shoulders, upper arms, and thighs. Desmoid tumors are benign, which means they are not cancer. While the cells of the desmoid tumor do not travel to parts the body like cancer can, they can invade nearby tissue and are often very painful.

How do desmoid tumors occur?

An inherited mutation in one copy of the APC gene causes familial adenomatous polyposis and predisposes affected individuals to develop desmoid tumors. The desmoid tumors occur when a somatic mutation occurs in the second copy of the APC gene.

Which MR imaging findings are characteristic of perianal fistula?

Characteristic MR imaging findings are obtained for perianal fistulas and abscesses with the different sequences of the protocol described in the Table. Unenhanced T1-weighted images provide an excellent anatomic overview of the sphincter complex, levator plate, and ischiorectal fossa.

What are the imaging features of desmoid tumors?

There are no specific imaging features to distinguish desmoid tumors from other solid masses. The diagnosis of desmoid tumor should be considered in patients with an abdominal mass, a history of abdominal surgery or injury, or Gardner syndrome.

Is endosonography a viable alternative to MR imaging for perianal fistula?

However, while MR imaging is superior in all respects, endosonography remains a viable alternative for identification of the internal opening. Accordingly, it is becoming increasingly recognized that MR imaging plays a crucial role in preoperative evaluation of perianal fistula and the patient outcome.

What are desmoid fibroblastic tumors?

Desmoid tumors are characterized by proliferation of fibroblastic cells that arise from the fascia or aponeurosis of muscle. They are most commonly found in the abdomen of adults, arising from the anterior abdominal wall, mesentery, or retroperitoneum. At sonography, desmoids have variable echogenicity, with smooth, well-defined margins.