Navigating the Complexities of Carcinoid Heart Disease and Severe Coronary Artery Disease: A Case for Multidisciplinary Collaboration

This case report presents a 71-year-old male with a complex cardiac pathology involving severe coronary artery disease (CAD) and carcinoid heart disease (CHD) secondary to metastatic neuroendocrine tumor (NET). The patient presented with symptoms of orthopnea, persistent lower extremity edema, and fatigue. Diagnostic investigations revealed a highly elevated coronary artery calcium score, echocardiographic evidence of right-sided heart involvement typical of CHD, and positron emission tomography/computed tomography (PET/CT) confirmation of metastatic NET. This case highlights the diagnostic challenges posed by the coexistence of CHD and CAD and emphasizes the need for a multidisciplinary approach to optimize patient management.