Double track sign is seen in –
**Core Concept**
Double track sign is a radiological finding observed in ultrasound imaging, specifically in the context of gallbladder disease. It refers to the presence of two distinct layers of echogenic material within the gallbladder wall, which can be indicative of chronic gallbladder inflammation or fibrosis.
**Why the Correct Answer is Right**
The double track sign is thought to result from the contraction of the circular and longitudinal smooth muscle layers of the gallbladder wall, which leads to the formation of two distinct echogenic layers. This phenomenon is often seen in patients with chronic cholecystitis or in those who have undergone previous gallbladder surgery. The double track sign can be mistaken for other gallbladder pathologies, such as gallstones or adenomyomatosis, but its characteristic appearance and location within the gallbladder wall help to distinguish it from these conditions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a non-specific term that does not accurately describe a radiological finding.
**Option B:** This option is incorrect because it refers to a different type of gallbladder pathology, characterized by the presence of Rokitansky-Aschoff sinuses and an increased risk of gallbladder cancer.
**Option C:** This option is incorrect because it is a term used to describe a different type of gallbladder disease, characterized by the presence of multiple small stones within the gallbladder.
**Clinical Pearl / High-Yield Fact**
The double track sign is an important radiological finding that can help to distinguish chronic gallbladder inflammation from other gallbladder pathologies. It is essential to recognize this sign in ultrasound images to avoid misdiagnosis and ensure accurate patient management.
**Correct Answer: B. Rokitansky-Aschoff sinus is related to gallbladder adenomyomatosis.**