Syndrome of inappropriate antidiuretic hormone secretion and Leser-Trélat syndrome as uncommon paraneoplastic manifestations of renal malignancy - a geriatric experience: a case report.

Background: Leser-Trélat syndrome, which manifests as eruptive multiple seborrheic keratoses, is a rare paraneoplastic sign. Hyponatremia in the elderly population is an often overlooked but potentially sinister biochemical abnormality. Cancer-related causes of hyponatremia include syndrome of inappropriate antidiuretic hormone secretion, cerebral or renal salt wasting, and adrenal dysfunction.