Question
A "double bubble" sign on an antenatal ultrasound examination in a gravid woman is diagnostic of
The correct answer is
Duodenal atresia
Understanding the Double Bubble Sign
The "double bubble" sign observed during an antenatal ultrasound refers to the appearance of two distinct, fluid-filled structures in the fetal abdomen. This specific finding is characteristic of proximal gastrointestinal obstruction.
Diagnostic Significance
- The first "bubble" represents the distended stomach.
- The second "bubble" represents the distended proximal duodenum.
- This configuration arises when there is a blockage in the duodenum, preventing the passage of amniotic fluid from the stomach into the intestines.
Evaluating the Options
- Anencephaly is a neural tube defect, not associated with the double bubble sign.
- Hydronephrosis is the swelling of the renal pelvis due to urine backup, affecting the kidneys.
- Meningomyelocoele is a spinal cord defect.
- Duodenal atresia, a congenital condition where the duodenum is blocked or absent, directly causes the characteristic double bubble sign due to obstruction.
Conclusion
Therefore, the "double bubble" sign on an antenatal ultrasound is diagnostic of Duodenal atresia.
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Important Questions from Developmental Disorders
Which of the following are correct regarding androgen insensitivity syndrome?
1. Inherited as X-linked recessive disorder
2. Karyotype is 46 XXY
3. It is also called testicular feminization
4. Confirmation of diagnosis by gonadal biopsy
Select the answer using the code given below.
- A 16-year-old girl with primary amenorrhoea presents to the gynaecology OPD for evaluation. She has normal secondary sexual characters. Her karyotype is 46,XX and ultrasound reveals normal ovaries and tubes but absent uterus. What is her clinical diagnosis?
- The Gartner's duct cyst is usually located in
- Which one of the following statements is NOT correct regarding Gastroschisis?
- A 16 year old girl presents with primary amenorrhea with absent vagina, cervix and uterus in the presence of normal secondary sexual characteristics. Ovaries are present on USG. The most probable diagnosis is:
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