What parasite is discovered during a laparotomy in a five-year old intact female Labrador retriever?

The identification of Dipetalonema reconditum during a laparotomy in a five-year-old intact female Labrador retriever is consistent with the characteristics of this parasite. Dipetalonema reconditum, a filarial worm, is known to infect dogs and is typically found in subcutaneous tissues and can sometimes be discovered during surgical procedures such as laparotomy.

This parasite is transmitted primarily by fleas and can cause mild, often asymptomatic infections in dogs. Its presence may be revealed during a surgical examination, particularly if the dog has experienced flea infestations or has had prior exposure to environments where this parasite is prevalent.

In contrast, the other parasites listed do not align with the setting of a laparotomy in a dog. Cryptococcus neoformans is a fungus that typically affects the respiratory system and would not be found during a laparotomy focused on physical examination of the abdominal cavity. Echinococcus granulosus, while a tapeworm that can infect dogs, is more commonly associated with the presence of hydatid cysts in the liver and lungs rather than direct observation during laparotomy. Lastly, Ascaris suum is a roundworm primarily affecting swine and is not a common concern for dogs. Thus, the context and nature