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Gallbladder (GB) wall thickening is defined as wall thickness > 3 mm on ultrasound. It is a nonspecific imaging finding with a broad differential—ranging from primary gallbladder disease to systemic conditions.
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| Etiology | Causes |
|---|---|
| Primary Gallbladder Causes | • Acute cholecystitis (calculous/acalculous) |
| • Chronic cholecystitis | |
| • Adenomyomatosis | |
| • Gallbladder carcinoma | |
| • Xanthogranulomatous cholecystitis | |
| Secondary (Extracholecystic) Causes | • Hepatic disease: hepatitis, cirrhosis |
| • Congestive cardiac failure (CCF) | |
| • Renal failure / hypoalbuminemia | |
| • Sepsis | |
| • Ascites / portal hypertension | |
| • Pancreatitis |
| Mechanism | Examples |
|---|---|
| Inflammation | Cholecystitis |
| Edema (subserosal fluid) | CCF, cirrhosis |
| Infiltration | Malignancy |
| Hyperplasia | Adenomyomatosis |
| Modality | Imaging features |
|---|---|
| US | • Thickness (>3 mm abnormal) |
| • Symmetry (diffuse vs focal) | |
| • Layering (double wall sign) | |
| • Intraluminal contents (stones/sludge) | |
| • Murphy’s sign | |
| • Pericholecystic fluid | |
| CT | • Wall enhancement pattern |
| • Subserosal edema (low attenuation halo) | |
| • Adjacent inflammation | |
| • Detect complications (perforation, abscess) | |
| MR | • Better tissue characterization |
| • T2 hyperintensity in edema | |
| • MRCP for biliary pathology |
![Ultrasound features of benign and malignant gallbladder wall thickening. A: Mild symmetrical mural thickening with clearly defined layers (arrow) suggestive of benign thickening; B: Asymmetrical mural thickening with foal discontinuity of mucosa (arrow) suggestive of malignant thickening; C: Marked circumferential mural thickening with mesh like architecture (arrow) is seen. Also note the nodular outline of liver (short arrow) and ascites (white arrow) suggestive of decompensated ascites as the underlying cause.
Gupta P, Marodia Y, Bansal A, Kalra N, Kumar-M P, Sharma V, Dutta U, Sandhu MS. Imaging-based algorithmic approach to gallbladder wall thickening. World J Gastroenterol 2020; 26(40): 6163-6181 [PMID: 33177791 DOI: 10.3748/wjg.v26.i40.6163]](attachment:4272f8d7-4887-4622-9a60-32b8c0779f98:WJG-26-6163-g001.png)
Ultrasound features of benign and malignant gallbladder wall thickening. A: Mild symmetrical mural thickening with clearly defined layers (arrow) suggestive of benign thickening; B: Asymmetrical mural thickening with foal discontinuity of mucosa (arrow) suggestive of malignant thickening; C: Marked circumferential mural thickening with mesh like architecture (arrow) is seen. Also note the nodular outline of liver (short arrow) and ascites (white arrow) suggestive of decompensated ascites as the underlying cause.
Gupta P, Marodia Y, Bansal A, Kalra N, Kumar-M P, Sharma V, Dutta U, Sandhu MS. Imaging-based algorithmic approach to gallbladder wall thickening. World J Gastroenterol 2020; 26(40): 6163-6181 [PMID: 33177791 DOI: 10.3748/wjg.v26.i40.6163]
Pattern-Based Approach
| Pattern | Likely cause | Imaging features |
|---|---|---|
| Diffuse Symmetric Thickening | Likely benign/systemic | • GB wall edema (CCF, cirrhosis) |
| • Hepatitis | ||
| • Renal failure | ||
| Diffuse Thickening with Inflammation | Suggests cholecystitis | • Gallstones |
| • Positive Murphy’s sign | ||
| • Hyperemia | ||
| • Pericholecystic fluid | ||
| Focal or Asymmetric Thickening | Suspicious for malignancy | • Irregular wall |
| • Loss of layering | ||
| • Mass replacing GB | ||
| • Liver invasion | ||
| Focal Thickening with Comet-tail Artifact | ‣ | • Rokitansky–Aschoff sinuses |
| • Reverberation artifact |
Reporting format of the gallbladder wall thickening.
Gupta P, Marodia Y, Bansal A, Kalra N, Kumar-M P, Sharma V, Dutta U, Sandhu MS. Imaging-based algorithmic approach to gallbladder wall thickening. World J Gastroenterol 2020; 26(40): 6163-6181
| Condition | Key Imaging Features |
|---|---|
| Acute cholecystitis | Stones + Murphy’s + hyperemia |
| Wall edema | Symmetric + layered + systemic disease |
| Adenomyomatosis | Comet-tail artifact |
| Carcinoma | Focal irregular thickening/mass |
| Chronic cholecystitis | Mild thickening + contracted GB |