Through a randomized controlled trial (RCT) design, this study aiming to evaluated the efficacy and safety of rituximab lymph node injection combined with pulmonary vascular interventional therapy in treating fibrosing mediastinal pulmonary hypertension (FM-PH).Eligible participants were randomly assigned to either the combined treatment group, receiving both pulmonary vascular intervention and rituximab lymph node injection, or the interventional-only group, which received pulmonary vascular intervention alone. At 3, 6, and 12 months post-treatment, the efficacy was assessed based on symptom improvement, hemodynamic changes, lesion volume reduction, etc. Safety was mainly evaluated by comparing adverse event incidence between the two groups.