A 7-year-old boy is brought to the physician by his mother for a 2-month history of a growing lump on his neck. The patient does not report any pain or recent illnesses. Vitals are: temperature 98.6 F, HR 72, RR 16, BP 110/70.
Which of the following is the most likely explanation for this patient’s findings?
A) 1st arch
B) Branchial cleft
C) Foramen cecum
D) 3rd pouch
E) Rathke pouch
