Table 1:

Classification used for all contrast enhanced MRA exams that were negative for pulmonary embolism. This scheme is based on the need for further action by the referring clinician after reading the final radiology report. The method used by Richman et al. [18] is also provided for comparison. The findings that were not used by Richman et al. are listed under the category of new. In those cases in which more than one finding was included in the report, the most significant finding was used for classification. Thus each patient was entered only one time based on severity of the need for action by the referring clinician: Type 1 (Actionable) or Type 2 (not actionable).

Type	Richman Category	Severity and detailed List of Findings
1	A	Urgent findings which require immediate intervention: New Pneumonia, new acute aortic syndrome, new moderate to large pericardial or pleural effusion, new (mass) cancer, new septic emboli, new aortic aneurysm >3.0 cm, new pneumothorax
	B	Non-urgent findings which require further work-up or follow-up: Known cancer or metastatic disease, new lung nodules, lymphadenopathy, new cardiomegaly, enhancing thyroid nodule >1cm, cirrhosis, splenic or renal infarcts, pancreatitis, pericarditis, costochondritis, acute rib fractures, known metastases, gall stones without cholecystitis.
	New for this study	Enhancing breast mass, biliary ductal dilatation, portal venous clots, sarcoidosis, pulmonary artery >3.0 cm suspicious for pulmonary hypertension, Hypersensitivity Radiation pneumonitis, or Drug related organizing pneumonia, invasive Aspergillosis, new or old pulmonary fibrosis, Lymphangitic carcinomatosis, Sternal dehiscence, iron overload of liver and spleen
2	C	Findings requiring no further action: Simple cysts in the liver or kidney, liver hemangioma, vertebral body hemangioma, normal vascular variant, small pleural effusion, mild atelectasis, known cardiomegaly, old wedge compression fracture, hiatal hernia, artifacts, post-surgical changes, degenerative disease of the spine.
	D	Known chronic diseases under current treatment, Anatomic variant or indeterminant findings not requiring follow-up: Atelectasis, post-surgical changes, aberrant right subclavian artery, right aortic arch with tetralogy of Fallot (known), vertebral artery arising from the aorta, Bovine arch, two right renal arteries, liver hemangioma, low right hemidiaphragm, small pleural effusion, median arcuate ligament of celiac artery, liver cyst, bronchiectasis, renal cysts, replaced left hepatic artery, symmetric gynecomastia, azygous continuation of the Inferior vena cava, perfusion defect without pulmonary embolism, hepatomegaly, vertebral body hemangioma, cystic fibrosis with known bronchiectasis, old compression fracture of thoracic spine vertebral body, elevated right hemidiaphragm, thyroid nodule less than 1.0 cm in size, known polycystic kidney disease, extra renal pelvis, mediastinal lipomatosis, known cardiac enlargement, two renal arteries, pectus excavatum, air trapping, hepatic steatosis, cholecystomy clips, lung granulomas, Amplatzer ASD closure device, treated chronic clot in brachiocephalic vein, accessory hepatic vein, hepatomegaly, replaced left hepatic artery, vertebral artery arising from the aortic arch, splenomegaly, known Obliterative bronchiolitis from lung transplant rejection, post mastectomy changes, enlarged pulmonary artery, gastric diverticulum, splenic granulomas, intrathoracic splenosis.
3	New for this study	Normal exam