An infant presents with failure to thrive and abdominal distension. His X-ray chest & abdomen showed the following. Diagnosis?
**Core Concept**
The underlying principle in this question is the clinical presentation of intestinal obstruction in infants, which can be caused by anatomical or functional issues. Intestinal obstruction can lead to failure to thrive, abdominal distension, and other severe complications.
**Why the Correct Answer is Right**
The X-ray findings are suggestive of intestinal obstruction, likely due to a congenital anomaly. The correct answer is consistent with a diagnosis of **Intestinal Atresia**, a congenital defect where there is a complete or partial obstruction of the intestine due to a failure of recanalization during fetal development. This condition often presents with bilious vomiting, abdominal distension, and failure to thrive in infants. The X-ray findings may show multiple air-fluid levels, a "double bubble" sign, or a "string of pearls" sign.
**Why Each Wrong Option is Incorrect**
**Option A:** is incorrect as it does not directly relate to the X-ray findings or the clinical presentation of intestinal obstruction in infants. While it is a possible diagnosis, it is not the most likely cause of the X-ray findings described.
**Option B:** is incorrect as it does not match the typical X-ray findings of intestinal obstruction in infants. While it may be a possible diagnosis, it does not account for the abdominal distension and failure to thrive.
**Option C:** is incorrect as it is a more common cause of intestinal obstruction in infants, but it would typically present with a different set of X-ray findings, such as a "coiled spring" appearance.
**Clinical Pearl / High-Yield Fact**
In infants presenting with failure to thrive and abdominal distension, always consider intestinal obstruction as a possible diagnosis, and look for X-ray findings that suggest a congenital anomaly, such as intestinal atresia.
**Correct Answer:** C.