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58122 Medicine

A 19-year-old man presents with coughing up blood and decreased urine output. On examination, he has normal air entry, and heart sounds. There is no skin rash or lymph nodes and his abdomen is normal. CXR reveals patchy infiltrates in both lower lobes and his creatinine is elevated. Urinalysis is positive for red cells and protein. A renal biopsy reveals autoantibodies to basement membranes. Which of the following is the most likely diagnosis?

Athyroiditis
Bmyasthenia gravis
CGoodpasture's syndrome
Dthrombocytopenia
Medicine
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