**Question:** Focal and diffuse thickening of gallbladder wall with high amplitude reflections and 'comet tail' artifacts on USG suggest the diagnosis of –

**Core Concept:** Ultrasonography (USG) findings in gallbladder diseases

**Why the Correct Answer is Right:**

In this question, the correct answer refers to a specific ultrasound (USG) finding in patients presenting with gallbladder wall thickening. USG is a widely used imaging technique for evaluating the gallbladder, as it is non-invasive, cost-effective, and widely available. The 'comet tail' artifacts are a characteristic finding in imaging, which indicates the presence of increased echogenicity in the gallbladder wall. High amplitude reflections indicate the thickening of the gallbladder wall.

**Why Each Wrong Option is Incorrect:**

A. Gallstones: Gallstones can cause cholecystitis, which is inflammation of the gallbladder. However, the 'comet tail' artifacts are not a standard finding in gallstones and are more associated with other conditions.

B. Choledocholithiasis: This refers to the presence of stones in the common bile duct, not in the gallbladder itself, and thus does not explain the high amplitude reflections and 'comet tail' artifacts mentioned in the question.

C. Choledocholithiasis with cholecystitis: While choledocholithiasis and cholecystitis are both related to gallbladder diseases, the specific USG findings described in the question are more consistent with cholecystitis.

D. Choledocholithiasis with cholecystolithiasis: This option combines choledocholithiasis (stones in the common bile duct) and cholecystolithiasis (stones in the gallbladder). While both conditions can coexist, the specific USG findings described in the question are more consistent with cholecystitis.

E. Cholangitis: Cholangitis refers to inflammation of the bile ducts, not gallbladder. The described USG findings are more consistent with cholecystitis.

**Core Concept:** Ultrasonography (USG) findings in gallbladder diseases

**Why the Correct Answer is Right:**

Choledocholithiasis, though potentially coexisting with cholecystitis, does not directly explain the high amplitude reflections and 'comet tail' artifacts mentioned in the question. Choledocholithiasis is characterized by the presence of stones in the common bile duct, while the described USG findings, including high amplitude reflections and 'comet tail' artifacts, are more consistent with cholecystitis, which is characterized by inflammation of the gallbladder. Choledocholithiasis is a separate entity with different USG findings.

**Why Each Wrong Option is Incorrect:**

Option A (gallstones) and E (cholangitis) are related to gallbladder diseases, but these options do not directly explain the high amplitude reflections and 'comet tail' artifacts mentioned in the question. Gallstones and cholangitis have different USG findings compared to cholecy