First report of sarcoma associated with peritoneal and pleural mesocestoidosis in a dog 

January 22, 2026

An anatomic pathologist at the Texas A&M Veterinary Medical Diagnostic Laboratory, TVMDL, was listed as the second author on a newly published case report describing an unusual and severe case of a tapeworm larval infection in an Anatolian Shepherd dog, with evidence suggesting that long-term infection may have contributed to the development of cancer. The work was conducted during Katia R. Groch, DVM, PhD, Dipl ACVP’s residency training in the Department of Veterinary Pathobiology, VTPB, at Texas A&M University, where she played a key role in the anatomic pathology evaluation of the case. 

The study documents peritoneal and pleural larval mesocestoidosis complicated by soft tissue sarcoma formation and represents the first reported link between Mesocestoides spp. infection and sarcoma development in the canine species. In this case, the presence of tetrathyridia, the larval stage of Mesocestoides spp., within liver and spleen tumors suggests that chronic inflammation from the parasitic infection may have contributed to cancer development. 

Learn more about this review and read the full text by visiting the Veterinary Parasitology: Regional Studies and Reports. 

For more information on TVMDL’s testing options, visit tvmdl.tamu.edu or call the College Station lab at 1.888.646.5623. 

Maci Guay

Communications Specialist
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