Biliary sludge

Biliary sludge
Other namesGallbladder sludge, Microcrystalline disease, Biliary sediment, Thick bile, Biliary sand, biliary gravel
Abdominal ultrasonography showing biliary sludge and gallstones
SpecialtyGastroenterology

Biliary sludge refers to a viscous mixture of small particles derived from bile.[1][2] These sediments consist of cholesterol crystals, calcium salts, calcium bilirubinate, mucin, and other materials.[1][2][3]

Signs and symptoms

Complications

Biliary sludge may cause complications such as biliary colic, acute cholecystitis, acute cholangitis, and acute pancreatitis.[1][2]

Cause

Biliary sludge has been associated with pregnancy, rapid weight loss, total parenteral nutrition, drugs such as ceftriaxone and octreotide, solid organ transplantation, and gastric surgery.[1][2] In many of these conditions, it is thought that the impairment in the contractility of the gallbladder leads to the formation of the sludge.[2]

Pathophysiology

The pathophysiology of biliary sludge formation is likely related to gallbladder dysmotility.[2] It is presumed that because the gallbladder is unable to effectively empty, the biliary sludge can start to accumulate.[2]

Diagnosis

Gallbladder hepatization, which is biliary sludge filling the entire gallbladder, giving it an echogenicity similar to the liver (seen at left). The patient had a stone in the cystic duct.

Biliary sludge is typically diagnosed by CT scan or transabdominal ultrasonography.[1][2] Endoscopic ultrasonography is another more sensitive option. However, the gold standard is considered to be direct microscopy of aspirated gallbladder bile.[1][2] This method is much more sensitive, although it is less practical.[2]

Treatment

For patients without symptoms, no treatment is recommended. If patients become symptomatic and/or develop complications, cholecystectomy is indicated.[1] For those who are poor surgical candidates, endoscopic sphincterotomy may be performed to reduce the risk of developing pancreatitis.[1]

Prognosis

The clinical course of biliary sludge can do one of three things: (1) it can resolve completely, (2) wax and wane, or (3) progress to gallstones.[1][2][3] If the biliary sludge has a cause (e.g. pregnancy), it oftentimes is resolved when the underlying cause is removed.[3]

Epidemiology

The prevalence of biliary sludge is low in the general population.[2] It has been reported that the prevalence ranges from 0-0.20% in men and 0.18-0.27% in women.[2] However, in patients with certain conditions, the prevalence may be higher.[2]

See also

References

  1. ^ a b c d e f g h i Shaffer, E. A. (2001). "Gallbladder sludge: What is its clinical significance?". Current Gastroenterology Reports. 3 (2): 166–73. doi:10.1007/s11894-001-0015-6. PMID 11276386. S2CID 46592201.
  2. ^ a b c d e f g h i j k l m n Pazzi, P; Gamberini, S; Buldrini, P; Gullini, S (2003). "Biliary sludge: The sluggish gallbladder". Digestive and Liver Disease. 35 Suppl 3: S39-45. doi:10.1016/s1590-8658(03)00093-8. PMID 12974509.
  3. ^ a b c "Gallbladder and Bile Duct Disorders". Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc. Retrieved 15 January 2015.

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