Published in:
01-11-2017 | Classics in Abdominal Imaging
Diamond ring sign
Published in: Abdominal Radiology | Issue 11/2017
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Sonograms at 5–6 weeks of gestational age depict the embryo as a focal thickening at the periphery of the yolk sac—an appearance referred to as “diamond ring” sign (Fig. 1) [1]. The yolk sac represents the “ring” and the embryo represents the “diamond” in this earliest sign of embryonic development [2, 3].
Fig. 1
Transvaginal scan showing ‘diamond ring’ sign within the gestational sac of 6–7 weeks’ size. Straight white arrow represents the ring (yolk sac) and the curved arrow denotes the embryo (diamond). Asterisk denotes a small subchorionic collection
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