Neoplasia USMLE Step 1 Practice Question
A 64-year-old man with a 50-year smoking history presents with dyspnea and chest pain. Vital signs show BP 138/82, HR 102, RR 22, SpO2 88% on room air. Chest CT reveals a 6 cm central hilar mass with mediastinal involvement. Brain MRI shows multiple metastases. Labs demonstrate hyponatremia (Na 118 mEq/L) consistent with SIADH. He denies hemoptysis. Which lung cancer subtype is most likely?
Answer choices
- ASquamous cell carcinoma
- BAdenocarcinoma
- CSmall cell lung cancerCorrect answer
- DMesothelioma
- ELarge cell carcinoma
- FBronchioloalveolar carcinoma
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.