A fatal case of intrathoracic cuterebriasis in a cat.

A seven-year-old, castrated male domestic shorthair was presented with lethargy, fever, and sneezing. In spite of intensive therapy, the cat's condition progressively worsened to severe dyspnea and death. At necropsy, a single, second instar larval stage of Cuterebra sp. was found in the trachea. This represents an unusual site for Cuterebra migration in an aberrant host. The cause of death was attributed to a combination of local tissue damage and anaphylaxis. Veterinarians should include Cuterebra migration in their differential diagnosis list for dyspnea.