Question 86
A 28-year-old woman presents to your office with a 6-month history of intermittent dizziness associated with nausea and a rotational sensation. Physical examination shows pallor of 1 optic disk, generalized hyperreflexia and nystagmus to the left. Which one of the following is the most likely diagnosis?
Question 87
A 12-year-old boy is brought by his mother to your clinic with a history of attention-deficit/hyperactivity disorder. His mother reports that he has been taking immediate-release methylphenidate for 2 years. Although the medication was initially effective, it no longer seems to work. The teachers say he is disorganized and fidgety, verbally interrupts class, and does not complete his work. His mother tells you that he does listen at home. Which one of the following is the most important next step in management?
Question 88
A 12-year-old boy initially presents with a 4-month history of left knee pain. He denies any obvious history of trauma, but he plays basketball frequently and notes his pain is worse after playing. On physical examination the patient has a prominent tibial tubercle, which is swollen and tender. There is full range of motion in the knee. A radiograph of the left knee reveals an ossicle anterior to the tibial tuberosity. Which one of the following is the most likely diagnosis?
Question 89
A 62-year-old man (wealthy philanthropist) with emphysema from smoking and a 21-year-old woman (elementary teacher) with cystic fibrosis are both compatible matches for a lung transplant. Which criterion determines organ allocation?
Question 90
A previously healthy 7-year-old boy presents to the Emergency Department with a generalized tonic-clonic seizure, which subsided spontaneously after 10 minutes. There is no history of trauma. Physical examination reveals normal vital signs and a normal neurologic examination. Which one of the following diagnostic studies is urgently indicated?