Figure 9b. Intraparenchymal gas within a fibroid following UAE. (a, b) Axial transabdominal US image obtained prior to UAE (a) reveals a large, 11-cm intramural fibroid (cursors). Follow-up sagittal transvaginal US image obtained 4 months after UAE (b) shows a decrease in the size of the fibroid (cursors), which now measures 7 cm. Note also the multiple focal bright areas (arrows) with reverberation artifacts representing intraparenchymal gas. The patient was asymptomatic. (c) Computed tomographic (CT) scan of the pelvis obtained 2 months after UAE in a different patient demonstrates large cavitating fibroids (F). Note the air within the fibroids (arrows), a finding that is consistent with necrosis.