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Figure 5b.  Hyperechoic line related to an underlying submucosal fibroid. (a) Transverse endovaginal US scan shows a hyperechoic line partially surrounding a thickened central endometrial complex with a bland internal architecture (arrows). (b) Subsequently obtained longitudinal hysterosonogram shows a submucosal fibroid with a large intracavitary component (arrow). (c) Sagittal T2-weighted MR image shows the large intracavitary component of the fibroid (arrowhead), which is hypointense.