Podcast
Questions and Answers
At what gestational age does the fetus take on a more human appearance?
At what gestational age does the fetus take on a more human appearance?
- 7 weeks
- 11 weeks
- 10 weeks (correct)
- 12 weeks
What structure can be seen adjacent to the fetus from about 7 weeks onwards?
What structure can be seen adjacent to the fetus from about 7 weeks onwards?
- Umbilical cord
- Round cystic structure (correct)
- Amniotic sac
- Placenta
What happens to the yolk sac at around 11 weeks?
What happens to the yolk sac at around 11 weeks?
- It starts to produce blood cells
- It disappears (correct)
- It begins to nourish the fetus
- It doubles in size
What is the approximate diameter of the round cystic structure seen adjacent to the fetus?
What is the approximate diameter of the round cystic structure seen adjacent to the fetus?
At what gestational age can the round cystic structure be seen?
At what gestational age can the round cystic structure be seen?
What is the benefit of scanning during weeks 18-22 of pregnancy?
What is the benefit of scanning during weeks 18-22 of pregnancy?
What percentage of mothers who claim to know their obstetric dates with certainty are in error when gestational age is calculated with ultrasound?
What percentage of mothers who claim to know their obstetric dates with certainty are in error when gestational age is calculated with ultrasound?
At what stage of pregnancy is scanning typically performed?
At what stage of pregnancy is scanning typically performed?
What is the importance of calculating gestational age with ultrasound?
What is the importance of calculating gestational age with ultrasound?
What can be a limitation of relying solely on obstetric dates for determining gestational age?
What can be a limitation of relying solely on obstetric dates for determining gestational age?
What characteristic does the margin of a nodule mentioned in point 19 have?
What characteristic does the margin of a nodule mentioned in point 19 have?
What type of margins does the nodule in point 20 have?
What type of margins does the nodule in point 20 have?
Which of the following is a characteristic of a nodule according to point 19?
Which of the following is a characteristic of a nodule according to point 19?
What can be said about the shape of the nodule mentioned in point 20?
What can be said about the shape of the nodule mentioned in point 20?
Which of the following statements is true about the nodule mentioned in point 19?
Which of the following statements is true about the nodule mentioned in point 19?
At what gestation period is an anembryonic gestation typically suspected?
At what gestation period is an anembryonic gestation typically suspected?
What is the recommended course of action if an early pregnancy is clinically normal but the ultrasound shows an enlarged uterus?
What is the recommended course of action if an early pregnancy is clinically normal but the ultrasound shows an enlarged uterus?
Between which weeks of pregnancy is the fetus best seen on ultrasound?
Between which weeks of pregnancy is the fetus best seen on ultrasound?
What is the primary indication for suspecting an anembryonic gestation?
What is the primary indication for suspecting an anembryonic gestation?
At what gestation period is the fetus typically visible on ultrasound?
At what gestation period is the fetus typically visible on ultrasound?
What is the maximum diameter of the body of the pancreas?
What is the maximum diameter of the body of the pancreas?
What is the diameter of the tail of the pancreas?
What is the diameter of the tail of the pancreas?
What is the maximum diameter of the pancreatic duct?
What is the maximum diameter of the pancreatic duct?
Which part of the pancreas has a diameter of less than 2 cm?
Which part of the pancreas has a diameter of less than 2 cm?
Which of the following statements is true about the pancreas?
Which of the following statements is true about the pancreas?
Study Notes
Ultrasound Scanning
- Scanning during weeks 18-22 of pregnancy provides more important information.
Fetal Development
- At 10 weeks, the fetus takes on a more human appearance.
- At 7 weeks, a round cystic structure (yolk sac) adjacent to the fetus is visible, approximately 4-5 mm in diameter.
Yolk Sac
- The yolk sac disappears at around 11 weeks, usually after 14 weeks, and is best seen between 18 and 22 weeks.
Gestational Age
- Up to 50% of mothers who claim to know their obstetric dates with certainty are in fact more than two weeks in error when gestational age is calculated with ultrasound.
Pancreas Measurement
- The body of the pancreas should be less than 2 cm in diameter.
- The tail of the pancreas should be around 2.5 cm in diameter.
- The diameter of the pancreatic duct should not exceed 2 mm.
Anembryonic Gestation
- If an early pregnancy is clinically normal but the uterus is enlarged on ultrasound, an anembryonic gestation should be suspected; repeat the examination after 7 days.
Nodule Characteristics
- A nodule with irregular angulated margins may be visible between 18-22 weeks.
- Most of its margin may be indistinct from the thyroid parenchyma.
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Description
Identify the characteristics of thyroid nodules based on their margins. This quiz assesses your knowledge of thyroid nodule morphology, including indistinct and irregular angulated margins.
