Comparison of two-dimensional time-of-flight dynamic magnetic resonance angiography with digital subtraction angiography in popliteal artery entrapment syndrome.
OBJECTIVE
To assess dynamic magnetic resonance angiography (MRA) as an alternative to catheter angiography in patients with popliteal artery entrapment syndrome (PAES).


METHODS
Nine patients with surgically proven PAES underwent provocation digital subtraction angiography (DSA) and 2-dimensional time-of-flight dynamic MRA of the popliteal fossae (total of 17 limbs). Eight normal volunteers also underwent dynamic MRA (total of 16 limbs). Two observers blinded to the surgical findings and the results of DSA independently evaluated the 33 limbs of the 17 subjects on the basis of maximum-intensity projection images and transverse MRA source images. The degree of stenosis was graded and compared with that indicated by DSA.


RESULTS
Among the 17 limbs of patients with surgically proven PAES, dynamic MRA suggested the correct diagnosis in 13 (76%) by indicating stenosis greater than 50%. Dynamic MRA indicated stenosis of 1% to 50% for 4 (25%) of the 16 normal limbs and no stenosis in the other 12 normal limbs (i.e., no false positive results).


CONCLUSIONS
Catheter angiography is not necessary if dynamic MRA indicates stenosis of greater than 50% in patients with clinical suspicion of PAES, but is recommended if dynamic MRA indicates stenosis of 1% to 50%.
Forster
B B
BB
Department of Radiology, Vancouver Hospital and Health Sciences Centre, BC.
Houston
J G
JG
Machan
L S
LS
Doyle
L
L
D000293:Adolescent; D000328:Adult; D015901:Angiography, Digital Subtraction; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000601:surgery; D003287:Contrast Media; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007472:Iohexol / Q000008:administration & dosage; D018810:Magnetic Resonance Angiography; D008297:Male; D016491:Peripheral Vascular Diseases / Q000000981:diagnostic imaging / Q000601:surgery; D011150:Popliteal Artery / Q000000981:diagnostic imaging*; D011446:Prospective Studies
D003287:Contrast Media; D007472:Iohexol