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Review Question - QID 109280

Syndrome of Inappropriate ADH (SIADH) Introduction Epidemiology QID: 109280 (M1.EC.17.4800)
In scope icon M 2 C
QID 109280 (Type "109280" in App Search)
A 75-year-old gentleman is brought to the ED with confusion that started earlier this morning. His family notes that he was complaining of feeling weak last night and also had a slight tremor at the time. He is afebrile and he has no known chronic medical conditions. Physical exam reveals a cooperative but confused gentleman. His mucous membranes are moist, he has no focal neurological deficits, and his skin turgor is within normal limits. His lab results are notable for:

Serum Na+: 123 mEq/L
Plasma osmolality: 268 mOsm/kg
Urine osmolality: 349 mOsm/kg
Urine Na+: 47 mEq/L

Which of the following malignancies is most likely to be responsible for this patient's presentation?
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