True about intrauterine fetal death (IUD):a) Gas bubbles in great vesselsb) Halo’s sign +vec) Overlapping of skull boned) Decreased amniotic fluid volume
**Core Concept**
Intrauterine fetal death (IUD), also known as fetal demise, refers to the death of the fetus after the 20th week of gestation. The diagnosis of IUD is crucial for managing the pregnancy and preventing complications.
**Why the Correct Answer is Right**
The correct answer, **d) Decreased amniotic fluid volume**, is a characteristic finding in IUD. This occurs due to the cessation of fetal urine production, which is a significant contributor to amniotic fluid volume. As a result, the decrease in amniotic fluid volume can be detected through ultrasound examination. This is a critical sign in diagnosing IUD, particularly in the second and third trimesters.
**Why Each Wrong Option is Incorrect**
* **Option A:** Gas bubbles in great vessels are not a characteristic finding in IUD. This option might be confused with the presence of air in the fetal circulation, which can occur in cases of fetal distress or maternal conditions such as eclampsia.
* **Option B:** Halo's sign is a characteristic radiological finding in conditions such as osteogenesis imperfecta, where there is a ring of increased density around the fetal skull. It is not a specific sign of IUD.
* **Option C:** Overlapping of skull bones can be seen in cases of fetal compression or deformation, such as in cases of multiple gestations or severe oligohydramnios. However, it is not a specific sign of IUD.
**Clinical Pearl / High-Yield Fact**
In cases of suspected IUD, it is essential to perform a thorough ultrasound examination to assess fetal viability and detect any signs of fetal demise. Decreased amniotic fluid volume is a critical finding that necessitates prompt evaluation and management.
**Correct Answer:** D. Decreased amniotic fluid volume.