Conservatively managed saddle pulmonary embolism.

Massive, submassive, and nonmassive pulmonary embolism relate to the hemodynamic state, while saddle pulmonary embolus is a purely radiologic term. Patients with saddle embolus often present with hemodynamic compromise. However, treatment depends on the clinical presentation, and stable patients with a saddle pulmonary embolus can respond well to conventional anticoagulation.