What is the normal appearance of the gestational sac in early pregnancy?

• A. Irregular shape with multiple layers
• B. Round or oval with normal decidual reaction
• C. Completely flat and elongated
• D. Variable shape with abnormal echo

Answer: (B)

In early pregnancy, the gestational sac is typically visualized as a round or oval structure on ultrasound. The normal decidual reaction refers to the thickened endometrial lining surrounding the gestational sac, indicating that the pregnancy is developing correctly. This appearance is associated with a healthy early pregnancy and provides vital information about the site of implantation and potential viability.

The round or oval shape of the gestational sac is essential for assessing the status of the pregnancy. Variations from this typical shape, such as irregular forms or abnormal echo patterns, may suggest complications, including ectopic pregnancies or potential miscarriage. The presence of a normal decidual reaction also signifies that the body is responding appropriately to the pregnancy hormones, further reinforcing the validity of the gestational sac's appearance in confirming an early pregnancy.