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Figure 1. (a) Scanning was initially peformed with a 3.5 MHz sector probe. A mixed echogenic mass was seen within the rectus sheath (arrows). (b) Using a broadband, high frequency linear array probe (5–12 MHz), more detail was obtained and suggested the diagnosis of rectus sheath haematoma. (c) Colour Doppler ultrasound showed a hypervascular nidus (long arrow) consistent with a pseudoaneurysm. The jet of the pseudoaneurysm (arrowhead) was seen to arise from the inferior epigastric artery. (d) Spectral Doppler waveform of the jet demonstrated the "to and fro" sign.
