A patient is brought to the emergency room following a seizure. Serum electrolyte studies demonstrate serum sodium of 128 mEq/L. The urine osmolarity is higher than the serum osmolarity. Chest x-ray demonstrates a lung mass. Which of the following forms of lung cancer is MOST likely to cause the described electrolyte imbalance?
Adenocarcinoma Bronchioloalveolar carcinoma Large cell carcinoma Small cell carcinoma