Q1. A 27 yo with no significant past medical history presents with a cough, dyspnea and chest discomfort of 4 weeks duration. He revealed an URTI about 6 weeks ago which spontaneously resolved. His past medical history is unremarkable, he denies smoking and has no allergies. Vital signs are normal and the exam reveals rubbery nodules in the left neck. His chest x-ray is shown. The radiologist feels that there is a mass lesion in the mediastinum. Which of the following is the least likely cause of his symptoms?
a. Thymoma
b. Thyroid
c. Teratoma
d. Lymphoma
e. Pheochromocytoma
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