Abstract
Tumoral obstruction is a small, but broadly defined, category of pulmonary hypertension that encompasses microvascular tumor emboli, tumor thrombotic microangiopathy, and macrovascular tumor obstruction within the pulmonary circulation. We present 4 patients with solid tumors, severe pre-capillary pulmonary hypertension, right ventricular failure, and pulmonary veno-occlusive-like disease. (Level of Difficulty: Advanced.).