FIG 11. Sonograms of the calcar avis simulating intraventricular hemorrhage.

A, AF parasagittal view shows a rounded masslike image mimicking an intraventricular clot within the occipital horn (arrow).

B, PF parasagittal view demonstrates that the mass is the calcar avis (arrow). Note its continuity with the occipital white matter and the calcarine fissure (CF).