Fatal esophageal fibrosarcoma associated to parasitism by spirurid nematode Spirocerca lupi in a dog: a case report.

A 7-years-old intact female mixed breed dog was referred to the private veterinary clinic because of history of intense food regurgitation. The plain X-ray examination and the contrast-enhanced X-ray using barium sulfate revealed the presence of a radio-opaque mass in the final third of the esophagus. Stool samples were collected and the coproparasitological test was done, which showed thick-shelled eggs from Spirocerca lupi.