Evaluation of an infant reveals hypocalcemia due to a lack of parathyroid hormone. On x-ray, the thymic shadow is absent. Which of the following embryonic structures is involved
Correct Answer: Third pharyngeal pouch
Description: Since thymus is missing, appropriate answer would be third pharyngeal pouch. This patient has got DiGeorge syndrome. DiGeorge syndrome causes migration defects of neural crest-derived tissues, paicularly affecting development of the third and fouh Branchial pouch (pharyngeal pouches)
Category:
Anatomy
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