Clinical case of dedifferentiated pleomorphic liposarcoma of the right upper limb soft tissues metastasing into the small intestine

Tumors of the small intestine account for no more than 0.5–3.5% of all tumors of the gastrointestinal tract and 0.1–0.3% of all oncological diseases. Besides primary tumors of the small intestine, metastasing into this organ is also possible. Distant metastases are observed in 15–20% of cases of dedifferentiated liposarcoma. We describe a clinical case of a 58-year-old patient with dedifferentiated soft tissue liposarcoma of the right shoulder (T2bN0M0, stage III, after combined treatment). Contrast abdominal CT revealed a site (about 145 mm long and up to 70 mm thick) of local dilatation of the small intestine with predominantly liquid contents and areas of contract accumulation and gas within the intestinal wall. There were more data for partial intestinal obstruction on the overview X-ray of the abdominal cavity. The X-ray with barium swallowing revealed a filling defect of about 10×8 cm without the mucosal folds corresponding to the tumor of small intestine. The conclusion was «Tumor of the small intestine?» Segmental resections of the affected areas were performed during laparotomic surgery. Histology revealed the metastases of ileomorphic soft tissue liposarcoma of the right upper limb. The clinical diagnosis is «Secondary malignant neoplasm of the retroperitoneal space and peritoneum. The condition after removal of soft tissue sarcoma of the chest. Mts into the right lung. The condition after PE».