**10. Complications**

A possible complication is chronic organized hematoma, well circumscribed, with massrelated symptoms. It is showed by Computed tomography (CT) like a homogeneous mass with capsule formation with a soft cystic center and a fibrous pseudo-capsule, whereas ultrasound shows it to resemble a multi-locular cyst. CT is unable to discriminate the chronic expanding hematoma from other soft tissue masses.

The mass is surrounded by a rim of hyalinized fibrous tissue with a chronic inflammatory infiltrate and granulation tissue (Nakano et al., 2010). Histologically, the mass is composed of necrotic debris, fibrin and blood clots. The lesion can be treated by hyperthermia, ultrasound therapy or shock waves or, finally, by excision (Silveira et al., 2010)
