Recent weight gain, hyponatremia with hyperosmolar urine in a chronic smoker with lung mass is suggestive of? (LQ)
a. The syndrome of inappropriate antidiuretic hormone (SIADH) is an important cause of dilutional hyponatremia that has been identified in tumors of the thymus gland, malignant lymphoma, and pancreatic neoplasms.
b. It occurs predominantly however, as a result of ectopic secretion of ADH by small cell carcinomas of the lung.