Thyroid Nodule Characteristics

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Questions and Answers

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?

Umbilical cord

Round cystic structure (correct)

Amniotic sac

Placenta

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?

4-5 mm Signup and view all the answers

At what gestational age can the round cystic structure be seen?

7 weeks Signup and view all the answers

What is the benefit of scanning during weeks 18-22 of pregnancy?

It provides much more important information Signup and view all the answers

What percentage of mothers who claim to know their obstetric dates with certainty are in error when gestational age is calculated with ultrasound?

Up to 50% of mothers Signup and view all the answers

At what stage of pregnancy is scanning typically performed?

At 18-22 weeks Signup and view all the answers

What is the importance of calculating gestational age with ultrasound?

It provides a more accurate estimate of the due date Signup and view all the answers

What can be a limitation of relying solely on obstetric dates for determining gestational age?

It may be more than two weeks in error Signup and view all the answers

What characteristic does the margin of a nodule mentioned in point 19 have?

Indistinct from the thyroid parenchyma Signup and view all the answers

What type of margins does the nodule in point 20 have?

Irregular and angulated Signup and view all the answers

Which of the following is a characteristic of a nodule according to point 19?

Margins indistinct from the thyroid parenchyma Signup and view all the answers

What can be said about the shape of the nodule mentioned in point 20?

It is irregular and angulated Signup and view all the answers

Which of the following statements is true about the nodule mentioned in point 19?

Its margin is indistinct from the thyroid parenchyma Signup and view all the answers

At what gestation period is an anembryonic gestation typically suspected?

Between 14 and 18 weeks Signup and view all the answers

What is the recommended course of action if an early pregnancy is clinically normal but the ultrasound shows an enlarged uterus?

Repeat the examination after 7 days Signup and view all the answers

Between which weeks of pregnancy is the fetus best seen on ultrasound?

18-22 weeks Signup and view all the answers

What is the primary indication for suspecting an anembryonic gestation?

Enlarged uterus on ultrasound Signup and view all the answers

At what gestation period is the fetus typically visible on ultrasound?

Around 14 weeks Signup and view all the answers

What is the maximum diameter of the body of the pancreas?

less than 2 cm Signup and view all the answers

What is the diameter of the tail of the pancreas?

2.5 cm Signup and view all the answers

What is the maximum diameter of the pancreatic duct?

2 mm Signup and view all the answers

Which part of the pancreas has a diameter of less than 2 cm?

Body of the pancreas Signup and view all the answers

Which of the following statements is true about the pancreas?

The tail of the pancreas is larger than the body Signup and view all the answers

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.