Syndrome of inappropriate antidiuretic hormone release as the initial presentation of adenocarcinoma of the colon.

Syndrome of inappropriate antidiuretic hormone release (SIADH) is a condition defined by the unsuppressed release of antidiuretic hormone (ADH) from the pituitary gland or nonpituitary sources or its continued action on vasopressin receptors. Of the many causes of SIADH, an important one includes tumours that secrete ADH. We describe a rare case of a patient with colonic adenocarcinoma presenting initially as SIADH.