Interlocking detachable coil embolization by technique of dumbbell-shaped framing and filling and bridge formation under balloon dilatation for huge conglomerate pulmonary arteriovenous malformation.

A 60-year-old woman presented with a conglomerate pulmonary arteriovenous malformation (PAVM) size 8.2 × 7.2 cm on chest X-ray. Feeding arteries were Aa7 and Ab7, A8, and A10. The diameter and length of the Ab7 neck were 15.5 and 16 mm, respectively. After percutaneous transcatheter embolization of A8 and A10, PTE of Aa7 and Ab7 was conducted under balloon occlusion with interlocking detachable coils using a technique of dumbbell-shaped framing and filling, making a bridge from Ab7 to the trunk of A9 and A10across A7. Follow-up computed tomography 10 months after treatment showed marked shrinkage of the PAVM.