Administrators, Editors, Administrators
3,484
edits
Changes
Jump to navigation
Jump to search
Expanded
{{Top
|author1=[[User:Mikael Häggström|Mikael Häggström]]
|author2=
}}
==Detection==
[[File:Ultrasonography of perihilar bile ducts, labeled.jpg|thumb|220px|Borderline of a dilated perihilar bile duct (see [[Ultrasonography of gallstones|Ultrasonography of ''gallstones'']] for detailed ranges).]]
On '''[[ultrasonography of the biliary tract]]''', the width of the duct is usually easiest for the perihilar bile duct (which is the region where the common hepatic duct becomes the common bile duct, at the hilum of the liver). A normal width of the perihilar bile duct can be reported as for the extrahepatic bile ducts, since it also excludes a more distal common bile duct obstruction. The common bile duct is normally up to 8 mm.<ref name="HoeffelAzizi2006">{{cite journal|last1=Hoeffel|first1=Christine|last2=Azizi|first2=Louisa|last3=Lewin|first3=Maité|last4=Laurent|first4=Valérie|last5=Aubé|first5=Christophe|last6=Arrivé|first6=Lionel|last7=Tubiana|first7=Jean-Michel|title=Normal and Pathologic Features of the Postoperative Biliary Tract at 3D MR Cholangiopancreatography and MR Imaging|journal=RadioGraphics|volume=26|issue=6|year=2006|pages=1603–1620|issn=0271-5333|doi=10.1148/rg.266055730}}</ref>
==Further workup==
In case of finding dilated bile ducts:
*Classify the severity of dilatation:
{|class="wikitable" align="center"
|+ Common bile duct diameter in adults<ref name=Lv>{{cite journal|url=https://www.ijntr.org/download_data/IJNTR01080032.pdf|title=Etiological Causes of Intrahepatic and Extrahepatic Bile Duct Dilatation|author=Yunfu Lv, Wan Yee Lau, Haiying Wu, Shunwu Chang, NingLiu, Yejuan Li, Jie Deng|journal=International Journal of New Technology and Research (IJNTR)|volume=1|issue=8|year=2015}}</ref>
| Normal || ≤ 8 mm
|-
| Mild dilatation || 8 – 12 mm
|-
| Moderate dilatation || 12 – 16 mm
|-
| Severe dilatation || 16 – 20 mm
|-
| Extremely severe dilatation || >20 mm
|}
*Attempt to determine the distal limit of the dilation (such as by the entry of the common hepatic duct into the pancreas), or alternatively the distal limit where the dilated bile duct is no longer visible.
[[File:Ultrasonography of common bile duct stone, with arrow.jpg|thumb|200px|Intraductal gallstone in a dilated common bile duct.]]
:If a distal limit is visible, look for wall thickening or intraductal gallstone.
==Report==
*Severity and quantity of dilation such as "Moderately dilated common bile duct of 14 mm."
*Even absence of visible findings at the distal limit of the dilation, or where it is no longer visible.
{{Reporting}}
{{Bottom}}
|author1=[[User:Mikael Häggström|Mikael Häggström]]
|author2=
}}
==Detection==
[[File:Ultrasonography of perihilar bile ducts, labeled.jpg|thumb|220px|Borderline of a dilated perihilar bile duct (see [[Ultrasonography of gallstones|Ultrasonography of ''gallstones'']] for detailed ranges).]]
On '''[[ultrasonography of the biliary tract]]''', the width of the duct is usually easiest for the perihilar bile duct (which is the region where the common hepatic duct becomes the common bile duct, at the hilum of the liver). A normal width of the perihilar bile duct can be reported as for the extrahepatic bile ducts, since it also excludes a more distal common bile duct obstruction. The common bile duct is normally up to 8 mm.<ref name="HoeffelAzizi2006">{{cite journal|last1=Hoeffel|first1=Christine|last2=Azizi|first2=Louisa|last3=Lewin|first3=Maité|last4=Laurent|first4=Valérie|last5=Aubé|first5=Christophe|last6=Arrivé|first6=Lionel|last7=Tubiana|first7=Jean-Michel|title=Normal and Pathologic Features of the Postoperative Biliary Tract at 3D MR Cholangiopancreatography and MR Imaging|journal=RadioGraphics|volume=26|issue=6|year=2006|pages=1603–1620|issn=0271-5333|doi=10.1148/rg.266055730}}</ref>
==Further workup==
In case of finding dilated bile ducts:
*Classify the severity of dilatation:
{|class="wikitable" align="center"
|+ Common bile duct diameter in adults<ref name=Lv>{{cite journal|url=https://www.ijntr.org/download_data/IJNTR01080032.pdf|title=Etiological Causes of Intrahepatic and Extrahepatic Bile Duct Dilatation|author=Yunfu Lv, Wan Yee Lau, Haiying Wu, Shunwu Chang, NingLiu, Yejuan Li, Jie Deng|journal=International Journal of New Technology and Research (IJNTR)|volume=1|issue=8|year=2015}}</ref>
| Normal || ≤ 8 mm
|-
| Mild dilatation || 8 – 12 mm
|-
| Moderate dilatation || 12 – 16 mm
|-
| Severe dilatation || 16 – 20 mm
|-
| Extremely severe dilatation || >20 mm
|}
*Attempt to determine the distal limit of the dilation (such as by the entry of the common hepatic duct into the pancreas), or alternatively the distal limit where the dilated bile duct is no longer visible.
[[File:Ultrasonography of common bile duct stone, with arrow.jpg|thumb|200px|Intraductal gallstone in a dilated common bile duct.]]
:If a distal limit is visible, look for wall thickening or intraductal gallstone.
==Report==
*Severity and quantity of dilation such as "Moderately dilated common bile duct of 14 mm."
*Even absence of visible findings at the distal limit of the dilation, or where it is no longer visible.
{{Reporting}}
{{Bottom}}
