An Infant Is Born with Facial Dysmorphia and a Cleft

An infant is born with facial dysmorphia and a cleft palate.  Further evaluation reveals a heart condition with a right-to-left shunt and the absence of a thymic shadow on x-ray.  The infant experiences frequent and recurrent sinopulmonary infections.  Examination of this patient's lymph nodes will most likely show poor development of which of the following structures?

A) Cortical follicles
B) Medullary sinuses
C) Medullary cords
D) Paracortex region
E) Subcapsular sinuses

Correct Answer:

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