Retroperitoneal dedifferentiated liposarcoma

Excerpt

A 55-year-old man presented to the primary care clinic complaining of foot pain, apparently secondary to plantar fasciitis. Incidentally, physical examination revealed an extensive nontender and firm well-delimited mass covering the entire right side of the abdomen. The patient was referred to our department, where he described a 9-month history of early satiety, and a weight loss of 20 kg. Abdominal radiograph showed a large hyperdense right-sided mass effect displacing bowel to the left quadrants and pelvis (Fig. 1a). Chest and abdominopelvic computed tomography showed an enormous retroperitoneal well-circumscribed tumor with some hypodense compounds and peripheral fat, compressing the organs around it (Fig. 1b). Complete surgical resection was performed obtaining a 48 × 40 × 30 cm and 16.8 kg tumor (Fig. 1c), dependent on perirenal fat. Radical ipsilateral nephrectomy was included in the same surgical procedure. Upon histological examination, a diagnosis of dedifferentiated liposarcoma (DDLPS) was confirmed, with no effect on renal tissue and negative margins.

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