Smoker with carcinoma of the lung. Well until recently. Bronchoscopy shows extrinsic compression of the bronchus. Low serum sodium. Diagnosis:

Question

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Small cell carcinoma of the lung is known for causing paraneoplastic syndromes, such as inappropriate secretion of antidiuretic hormone (SIADH), which can lead to low serum sodium (hyponatremia). It can also cause extrinsic compression of the bronchus due to its aggressive nature and tendency to grow rapidly.

Smoker with Carcinoma of the Lung