People with<unk>  lack traditional thrombosis risk factors. Current understanding is that<unk>  is a result of “inflammatory thrombosis”: When pro-thrombotic (blood-clot forming) conditions combine with<unk>  inflammation and infection, non-resolution of thrombus may ensue. Risk factors for<unk>  include splenectomy, inflammatory bowel disease,<unk>  thyroid hormone replacement, blood types other than 0, malignancy, infected ventriculo-atrial shunt and permanent intravenous leads.
Chronic thromboembolic pulmonary hypertension
Pulmonary hypertension
Portopulmonary hypertension
Pulmonary venoocclusive disease
Absent pulmonary valve syndrome
Bilharzial cor pulmonale
Asthma
Lettuce big-vein disease