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Vascular ring anomaly accession 180393

Vascular ring anomaly accession 180393. Katie Phillips. Corky. 7 mo male intact South Down sheep. Corky. Presented to NCSU for 1 month history of regurgitation and multiple episodes of bloat. Owner has had for only a little over a month

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Vascular ring anomaly accession 180393

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  1. Vascular ringanomalyaccession 180393 Katie Phillips

  2. Corky 7 mo male intact South Down sheep

  3. Corky • Presented to NCSU for 1 month history of regurgitation and multiple episodes of bloat. • Owner has had for only a little over a month • Only eats alfalfa leaves and avoids all stems and has been seen to regurgitate grain.

  4. Corky

  5. Corky - esophagram • Boluses of liquid barium 30% wt/vol by dose syringe • Oroesophageal tube with negative contrast

  6. Corky • Focal esophageal narrowing along cranial margin of heart base

  7. Anatomy

  8. Anatomy

  9. Embryology • Embryological arches are paired: some segments persist after birth as normal vessels while others regress.

  10. Persistent right aortic arch • Right aortic arch instead of left • Esophagus is entrapped by the ligamentumarteriosus that tethers the aorta to the left pulmonary artery. • Segmental esophageal dilation with constriction just cranial to tracheal bifurcation.

  11. PRAA • Radiographic signs: • Leftward deviation of trachea • Absence of left margin of descending aorta • Left subclavian artery - may cause shallow indentation cranial to constriction on VD view. • Persistent left cranial vena cava – complicates surgery, can no longer just do lateral PDA surgery.

  12. Double aortic arch • Esophagus is entrapped between aortic arches and heart base • Only vascular ring anomaly that can also encircle the trachea and cause dyspnea.

  13. Aberrant right subclavian artery • Right subclavian artery arising directly from aorta crosses over top of esophagus left to right. • Causes dorsal constriction of esophagus, tends to be more cranial than PRAA.

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