Key result
Persistent right aortic arch and aberrant left subclavian artery cause megaesophagus in a captive bison.
Why the study?
Persistence of the right aortic arch is relatively rare in ruminants and has not previously been reported in a bison.
Case Report (n=1)
This is the first reported case of a persistent right aortic arch in a bison, presenting with dysphagia and megaesophagus.
Answers are grounded in this paper and cite their sources.
May prompt consideration of vascular ring anomalies in dysphagic bison; leaves open prevalence and screening needs in captive herds.
An undersized, 16-mo-old, captive wood bison (Bison bison athabascae) was observed with dysphagia and postprandial regurgitation. The animal died shortly after anesthesia was initiated for diagnostic purposes. At necropsy, a persistent right aortic arch and aberrant left subclavian artery were diagnosed. The vascular ring structure around the esophagus and the trachea caused a megaesophagus with complete esophageal obstipation and ulcerative esophagitis. The aberrant left subclavian artery did not significantly compromise the esophagus. Persistence of the right aortic arch is relatively rare in ruminants and has not previously been reported in a bison.
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Peters et al. (2002) conducted a case report in Persistent right aortic arch and aberrant left subclavian artery (n=1). Persistent right aortic arch was evaluated on Necropsy findings. A 16-month-old captive wood bison with dysphagia was diagnosed at necropsy with a persistent right aortic arch and aberrant left subclavian artery causing megaesophagus.
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