A 4-year-old girl is brought to the physician for a painless lump on her neck. She has no history of serious illness and her vital signs are within normal limits. On examination, there is a firm, 2-cm swelling at the midline just below the level of the hyoid bone. The mass moves cranially when she is asked to protrude her tongue. Which of the following is the most likely diagnosis?
ACystic hygroma
BThyroglossal cyst
CRanula
DDermoid cyst
A 54-year-old man is brought to the emergency department 30 minutes after being hit by a car while crossing the street. He had a left-sided tonic-clonic seizure and one episode of vomiting while being transported to the hospital. On arrival, he is not oriented to person, place, or time. Physical examination shows flaccid paralysis of all extremities. A CT scan of the head is shown. This patient's symptoms are most likely the result of a hemorrhage in which of the following structures?
ABetween the dura mater and the arachnoid mater
BInto the cerebral parenchyma
CBetween the skull and the dura mater
DBetween the arachnoid mater and the pia mater
EInto the ventricular system
A 26-year-old woman presents to your clinic with complaints of increasing muscle fatigue that worsens after periods of sustained activity. She also reports both ptosis and diplopia that make reading in the late afternoon and evenings difficult. An edrophonium test is performed and is positive, demonstrating resolution of the patient's weakness. One organ in particular, when abnormal, is associated with this patient's condition. Which of the following embryologic structures gives rise to this organ?
A3rd branchial arch
B4th branchial pouch
C1st branchial pouch
D2nd branchial cleft
E3rd branchial pouch
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