Treated pulmonary arteriovenous malformations: patterns of persistence and associated retreatment success.

PURPOSE: To determine the relative frequencies of persistence patterns in treated pulmonary arteriovenous malformations (PAVMs) and to assess whether there is a difference in retreatment outcomes between PAVMs persisting via recanalization and those persisting via reperfusion.
MATERIALS AND METHODS: Between May 2003 and May 2011, 23 patients (10 male, 13 female; mean age, 44 years ± 18 [standard deviation]; age range, 12-72 years) who had PAVM embolization, persistence by computed tomography (CT), and a follow-up pulmonary arteriogram were included. This retrospective study was approved by the institutional review board and was fully HIPAA compliant. PAVMs were categorized as having recanalization, defined as persistence maintained by flow through a previously placed coil nest; reperfusion, defined as persistence through small feeders from adjacent normal pulmonary arteries; or incomplete treatment. Fifty-three persistent PAVMs were characterized; 38 of which had postretreatment CT data (median follow-up, 1 year). The retreatment success rate, defined by sac shrinkage on CT images, was assessed.
RESULTS: Recanalization was the most common pattern, occurring in 91% (n = 48) of 53 PAVMs. Pulmonary-to-pulmonary reperfusion occurred in 24% (n = 13) of 53 PAVMs. Angioarchitecture, coil-sac distance, coil number, and feeder diameter did not significantly differ between recanalized and reperfused PAVMs. There was a significant (P = .014) difference in retreatment success; retreatment was successful in 84% (n = 27) of 32 recanalized PAVMs but only 44% (n = 4) of nine reperfused PAVMs.
CONCLUSION: Recanalization through previously placed coils is the most common pattern of PAVM persistence and responds best to retreatment. Pulmonary-to-pulmonary reperfusion is less common and more difficult to re-treat successfully. Online supplemental material is available for this article. © RSNA, 2013.