Renal adenocarcinoma found in a clinically lame marbled duck (<i>Marmaronetta angustirostris</i>)

Lameness is a frequent reason for captive waterfowl to be presented veterinarian. This case report describes unilateral right hindlimb lameness in an 11-year-old, female marbled duck kept at zoological collection the United Kingdom. Although bird was euthanased after clinical and radiographic examination, both supported diagnosis of degenerative joint disease, postmortem examination revealed renal adenocarcinoma, which possibly put pressure on nerves left may have interfered with duck's mobility. highlights that coelomic issues lead avian patients and, as such, clinicians must consider changes soft tissue structures alongside skeletal abnormalities when evaluating images cases lameness.