]> 2026-07-31T07:28:08+00:00 WBR0112 0 en Abnormal development of the 1st and 2nd branchial pouches Abnormal development of the 2nd and 3rd branchial pouches Presence of a Barr body Abnormal development of the branchial pouch responsible for the development of the thymus only The 3rd branchial pouch is responsible for the development of the inferior parathyroid glands (dorsal wings) and the thymus (ventral wings). However, the 3rd branchial pouch is not the only involved branchial pouch in DiGeorge syndrome. The 4th branchial pouch, which is responsible for the development of the superior parathyroids (dorsal wings), is also involved. A microdeletion Embryology Genetics Immunology A newborn boy is found to be cyanotic following birth. Appropriate work-up is performed; and the patient is diagnosed with tetralogy of Fallot. In the patient's pre-operative chest x-ray report, the radiologist notes an absence of the thymic shadow. The patient then undergoes surgery that successfully corrects his cyanosis. Over the next few days, he suffers a seizure that is attributed to low calcium blood levels. Which of the following abnormalities most likely caused this child’s condition? E Cardiology Infectious Disease 2020-10-27T23:22:54Z 2459150.4742361 WBR0112