... patients and manifest as deeply located, soft tissuemasses in the head and neck region [16], thorax [17], ret-roperitoneum and pelvis [2,18] and extremities [19]. Theygrow slowly over years and ... history of chest and epigastric pain.A cardiac work-up and upper and lower gastrointestinalendoscopy was unrevealing, however, a computed tomog-raphy (CT) scan of the chest, abdomen and pelvis ... diagnosis of soft-tissue tumors. Diagn Cytopathol1986, 2:244-247.13. Krause HR, Hemmer J, Kraft K: The behaviour of neurogenictumours of the maxillofacial region. J Craniomaxillofac Surg 1993,21:258-261.14....