Liposarcoma pleomórfico originado en una localización inusual. Presentación de caso / Pleomorphic liposarcoma arising in an unusual site. A case report

Los liposarcomas son el grupo más común de las neoplasias mesenquimatosas malignas. Suelen aparecer en las extremidades y en el retroperitoneo. Es excepcional su localización intestinal. Se presenta el caso de un varón de 75 años que fue hospitalizado por anemia severa, en cuya TC se objetivó un engrosamiento de asa yeyunal de 5cm sospechoso de neoplasia. Se realizó resección parcial de intestino delgado. Macroscópicamente se identificó una tumoración polipoide ulcerada de 12×6cm. Microscópicamente se observó una neoplasia bien delimitada, ulcerada, de transición abrupta con una mucosa circundante normal, compuesta por lipoblastos pleomórficos sobre un fondo sarcomatoso. Existen muy pocos casos publicados de liposarcomas intestinales, la mayoría de los cuales eran liposarcomas bien diferenciados o desdiferenciados. Se presenta el caso de un liposarcoma pleomórfico de intestino delgado por su excepcional localización y la importancia en su diagnóstico diferencial.(AU)

Liposarcomas are the most common group of malignant mesenchymal neoplasms. They usually occur in the extremities and the retroperitoneum and only rarely in the intestine. We report the case of a 75-year-old man presenting with severe anaemia. A CAT scan revealed a 5cm thickening of the jejunal loop, arousing the suspicion of a neoplasm. A partial resection of the small intestine was performed. Macroscopy showed a 12×6cm ulcerated, polypoid mass. Microscopically, a well circumscribed, ulcerated tumour was seen, which had well-defined margins with the surrounding normal mucosa. It consisted of pleomorphic lipoblasts within a sarcomatous background. Very few cases of intestinal liposarcomas have been published and the majority report well-differentiated or undifferentiated liposarcomas. We present a case of a pleomorphic liposarcoma of the small intestine, which is an unusual location and emphases the importance of a comprehensive differential diagnosis.(AU)

[Pleomorphic liposarcoma arising in an unusual site. A case report]. / Liposarcoma pleomórfico originado en una localización inusual. Presentación de caso.

Liposarcomas are the most common group of malignant mesenchymal neoplasms. They usually occur in the extremities and the retroperitoneum and only rarely in the intestine. We report the case of a 75-year-old man presenting with severe anaemia. A CAT scan revealed a 5cm thickening of the jejunal loop, arousing the suspicion of a neoplasm. A partial resection of the small intestine was performed. Macroscopy showed a 12×6cm ulcerated, polypoid mass. Microscopically, a well circumscribed, ulcerated tumour was seen, which had well-defined margins with the surrounding normal mucosa. It consisted of pleomorphic lipoblasts within a sarcomatous background. Very few cases of intestinal liposarcomas have been published and the majority report well-differentiated or undifferentiated liposarcomas. We present a case of a pleomorphic liposarcoma of the small intestine, which is an unusual location and emphases the importance of a comprehensive differential diagnosis.