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Mrs.Vijayalakshmi Raja, Senior Sonographer, MediScan who described the “Premaxillary Triangle Sign” and incorporated it into the “Rule of Three”


Identifying the long axis of spine of the baby will help us to locate all the major anatomical fetal parts.


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1.Right Lung 2.Left Lung 3.Heart


1. Number 2. Alignment / Arrangement and 3. Size of the three vessels

P A S


1. Stomach 2. Portal vein and 3. Liver


Kidney - Transverse

Kidney - Coronal


1.Bladder 2.Two umbilical arteries 3.Genitalia

UA BLA UA


In each extremity we look for


1. Orbits 2. Nose and 3. Mouth.


Orbits


1.Placental attachment, 2.The free loop and 3.Cord entry into abdomen


TVS - Cervix


FL


II Trimester Obstetric Scan