| On grey-scale ultrasound imaging, 10x7 cm placental tissue was visualised with loss of the retroplacental sonolucent zone. |
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| Antenatal ultrasound scans demonstrate the venous sac as a sonolucent mass located posterior to the third ventricle. |
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| Sonography is able also to detect primary ascaridial perforation as two pairs of parallel lines, representing the worm outer margis, flanking a central sonolucent line, representing its digestive tract. |
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| The term describes a sonolucent area in the posterior fetal neck. |
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