Paraneoplastic Syndromes

Explore paraneoplastic syndromes through this comprehensive medical podcast that examines how certain cancers cause systemic effects extending beyond the primary tumor. Delve into SIADH in small-cell lung cancer, learning about the classic lab pattern of hyponatremia with inappropriately concentrated urine and the dangers of seizures or osmotic demyelination from overcorrection. Examine ectopic ACTH production from small-cell lung cancer, reviewing clinical features of Cushing syndrome, stepwise testing, and complications including infections, thromboembolism, and severe metabolic derangements. Understand Lambert-Eaton myasthenic syndrome (LEMS) with its characteristic proximal muscle weakness that improves with activity, autonomic symptoms, and connection to voltage-gated calcium channel antibodies. Study hypercalcemia of malignancy, focusing on PTHrP secretion by squamous lung cancers and potential complications like acute kidney injury and arrhythmias. Investigate neurologic manifestations including anti-NMDA receptor encephalitis associated with ovarian teratomas, marked by psychiatric changes, seizures, and autonomic instability that improves with tumor removal and immunotherapy. Learn about dermatomyositis as a paraneoplastic marker for ovarian carcinoma, featuring characteristic rashes, muscle weakness, and high malignancy risk. Examine myasthenia gravis linked to thymoma, emphasizing fluctuating ocular and bulbar symptoms, diagnostic testing, and the need for thymectomy in appropriate cases. Discover Trousseau syndrome and nonbacterial thrombotic endocarditis (NBTE) in pancreatic adenocarcinoma, where migratory thrombophlebitis and unexplained clots should raise suspicion for underlying malignancy. Master high-yield associations including small-cell lung cancer with SIADH, ectopic ACTH, and LEMS; squamous cancers with PTHrP hypercalcemia; ovarian teratoma with anti-NMDA encephalitis; thymoma with myasthenia gravis; and pancreatic adenocarcinoma with Trousseau syndrome and NBTE.