Chevron Sign is seen with?
Chevron Sign... I remember it's associated with intussusception. Intussusception is when a part of the intestine telescopes into another, causing obstruction. In an ultrasound, the layers of the bowel wall can look like a target or a bull's eye. But the Chevron Sign specifically refers to the appearance on X-ray where the cecum is distended and the ileum is intussuscepted into the cecum, creating a V-shaped shadow. Wait, maybe I'm mixing it up with the Target Sign. Let me verify.
Wait, the Target Sign is the same as the Bull's Eye Sign, seen on imaging like US or CT. The Chevron Sign is different. Oh right, in plain abdominal X-rays, when there's intussusception, the intussuscepted segment might appear as a V-shaped shadow in the right lower quadrant, which is the Chevron Sign. That's a classic finding.
So the correct answer is Intussusception. Now, the options were missing, but the user's correct answer is likely Intussusception. Let's structure the explanation. Core Concept would mention the Chevron Sign as a radiological finding in intussusception. The correct answer explanation would detail the X-ray appearance. The wrong options would be other conditions like appendicitis, volvulus, or Hirschsprung's disease. For each incorrect option, explain why they don't present with Chevron Sign. Clinical pearl would emphasize that Chevron Sign is a key indicator of intussusception, which is a surgical emergency. Finally, confirm the correct answer.
**Core Concept**
The Chevron Sign is a radiological finding observed in **intussusception**, an emergency condition where one segment of the intestine telescopes into an adjacent segment. It appears as a **V-shaped or chevron-shaped opacity** on plain abdominal radiographs, representing the distended cecum and intussuscepted ileum.
**Why the Correct Answer is Right**
In intussusception, the **ileum slides into the cecum**, causing a characteristic **V-shaped shadow** on X-ray due to overlapping bowel loops and gas-filled loops. This sign, along with the **Target Sign** (on ultrasound/CT), helps confirm the diagnosis. The Chevron Sign is pathognomonic for this condition, which is most common in children aged 6–36 months.
**Why Each Wrong Option is Incorrect**
**Option A:** *Appendicitis* typically shows a **fat stranding** or **appendicolith** on imaging, not a Chevron Sign.
**Option C:** *Volvulus* presents with a **coffee bean sign** or **whirl sign**, indicating twisted bowel.
**Option D:** *Hirschsprung’s disease* is diagnosed via **transition zone** on imaging or rectal biopsy, not Chevron Sign.
**Clinical Pearl / High-Yield Fact**
Never miss **Chevron Sign** on abdominal X-rays—it is a **classic red flag for intussusception**, which requires urgent intervention (e.g., air enema or surgery). Remember: **"Chevron = telescoped bowel"**.
**Correct Answer