]> 2026-07-31T07:28:12+00:00 WBR0139 0 en Truncus arteriosus Bulbus cordis Sinus venosum Third aortic arch Fourth aortic arch Embryology A 9-year-old boy is brought by his mother to the physician's office with complaints of recurring infections. On physical examination, the physician observes that the patient has low set ears and eyes that appear abnormally far apart. According to the child growth chart, the patient is underweight for his age. Upon further questioning, the mother explains that the patient experienced difficulty gaining weight as a child. Following appropriate work-up, genetic testing reveals a deletion in the long arm of chromosome 22. Abnormalities of which embryological structure is most commonly associated with this patient's condition? A Cardiology 2020-10-27T23:27:42Z 2459150.4775694 WBR0139