Banana and lemon sign is seen in which fetal anomalies?
**Core Concept**
The banana and lemon sign are ultrasound markers used to identify specific fetal anomalies. These signs are observed during fetal ultrasound examination and are associated with spina bifida and other neural tube defects.
**Why the Correct Answer is Right**
The banana sign refers to the curved shape of the cerebellum, resembling a banana, when viewed in the mid-sagittal plane. This occurs due to the displacement of the cerebellar vermis from the midline. The lemon sign is characterized by the scalloping of the frontal bones, giving the appearance of a lemon. Both signs are indicative of spina bifida, a congenital defect where the spinal column and spinal cord do not develop properly. The banana and lemon signs are often used in conjunction with other ultrasound markers to confirm the diagnosis.
**Why Each Wrong Option is Incorrect**
**Option A:** While the banana and lemon signs are associated with spina bifida, they are not specific markers for other fetal anomalies such as anencephaly.
**Option B:** The presence of the banana and lemon signs does not directly indicate the presence of Down syndrome.
**Option C:** The banana and lemon signs are not typically used to diagnose gastrointestinal anomalies such as gastroschisis.
**Option D:** The banana and lemon signs are not specific markers for cardiac anomalies such as hypoplastic left heart syndrome.
**Clinical Pearl / High-Yield Fact**
The banana and lemon signs are important ultrasound markers that can help identify spina bifida and other neural tube defects. These signs should be carefully examined during fetal ultrasound examination to ensure early diagnosis and appropriate management.
**Correct Answer:** A. Spina bifida.