Sophie,
To my understanding small-duct psc are the bile ducts up in your actual liver whereas the larger ducts are outside the liver going down to your common bile duct where your pancreas ties in. There are two branches of bile ducts coming off your liver. The left and Right hepatic ducts. The right side is the larger of the two if I remember correctly. Bottom line in my thinking, you either have PSC or don’t have PSC. The small duct PSC seems to progress more slowly than the other but the outcome eventually is the need of a liver transplant, but there are folks in this and other forums who have had PSC for a very long time and still haven’t needed a transplant so it’s a matter that is very hard to predict. These are good questions but a hepatologist will be the one to get guidance on. Just so you can have something to compare your MRCP with, here are 4 of mine, one year apart. The first one at initial diagnosis and the last one 2 months before my transplant. This will at least give you an idea of what I went through. Just remember everyone’s different. Don’t let any of this panic you, you just have to live one day at a time.
I went back to one of my earliest MRCP’s and here’s what they said about me at that time back in 2011.
"Mild intra and extrahepatic biliary duct dilatation with mild irregularity of the intrahepatic bile ducts, consistent with patient history of primary sclerosing cholangitis. No dominant stricture.
2. No evidence of cholangiocarcinoma.
3. Mild splenomegaly, unchanged.
Now here’s one a year later…
MR Abdomen:
The liver is normal size. There is no significant hepatic steatosis.
There are no visualized hepatic lesions. The portal vein and
hepatic veins are patent.
The common bile duct is normal size. There is a mild beaded
appearance particularly of the central left intrahepatic ducts. There
is minimal intrahepatic biliary ectasia centrally, similar to the
prior studies. There is a focal apparent narrowing at the proximal
left intrahepatic duct best seen on series 1900, image 1. This is
very similar to the prior study and likely to the older studies
however this is less well visualized on the outside older studies.
There is no ascites. The spleen is enlarged measuring 15 cm.
The gallbladder may be slightly thick walled however it is
nondistended. The common bile duct is normal size. There is a mild
beaded appearance particularly of the central left intrahepatic
ducts. There is minimal intrahepatic biliary ectasia centrally,
similar to the prior studies. There is a focal apparent narrowing at
the proximal left intrahepatic duct best seen on series 1900, image
- This is very similar to the prior study and likely to the older
studies however this is less well visualized on the outside older
studies.
The pancreas parenchyma is normal signal intensity, and there is no
pancreatic duct dilatation.
The adrenal glands are normal. There is a single left kidney which
appears unremarkable.
There is no definite lymphadenopathy.
IMPRESSION:
- There is minimal intrahepatic biliary duct prominence centrally
with a slight beaded appearance, consistent with a history of primary
sclerosing cholangitis. There is apparent narrowing at the proximal
most left intrahepatic duct which is similar to several prior
studies. This may represent pulsation artifact from the hepatic
artery. No focal mass is seen. Continued followup is recommended.
- Splenomegaly measuring 15 cm. Previously measured 14.7 cm.
Now another MRCP a year after the one above…
Findings:
There is no pleural effusion.
There is smooth hepatic contour. There is no signal dropout on post-phase
images to suggest hepatic steatosis. There is persistent splenomegaly
worsened from prior, now the spleen measures up to 16 cm from prior of 14.5
cm. There is no definite focal hepatic lesion. There is heterogeneous
perfusion on late arterial and portal venous phase images of the anterior
right and medial left hepatic lobe similar to prior exam. There is
otherwise normal perfusion of the hepatic parenchyma. On delayed post
Eovist enhanced images there is biliary excretion for example seen in a
single right hepatic ductal branch however there is no excretion within
gallbladder or other intrahepatic, extrahepatic ducts.
There is an accessory left hepatic artery arising from the left gastric
artery.
There is a persistent beaded appearance of intrahepatic biliary ducts with
multifocal mild intrahepatic biliary ductal dilatation, more pronounced
from prior examination. There are again-seen areas of increased T1 signal
again seen projecting in the region of the right hepatic lobe may represent
a small amount of sludge. There is no filling defect or central obstructing
mass. Common biliary duct is nondilated measuring up to 0.3 cm. Gallbladder
is decompressed and there is persistent pericholecystic fluid.
Pancreas is of normal signal intensity no focal pancreatic lesions or
pancreatic ductal dilatation.
The right adrenal gland is identified appears unremarkable. There is a
single left kidney visualized which demonstrates no hydronephrosis or other
abnormality.
There is a small para-umbilical hernia measuring 2.3 cm x 3.4 cm now with a
small amount of fluid.
No free pelvic fluid or bowel dilatation.
Impression:
- Worsened intrahepatic biliary ductal dilatation with beaded appearance
likely representing disease progression. No extrahepatic ductal dilatation.
- No evidence for cirrhosis or focal lesion.
- Decompressed gallbladder with pericholecystic fluid, unchanged from
multiple priors. Please correlate clinically for cholecystitis.
- New fluid within known para-umbilical hernia, correlate for symptoms.
- Persistent perfusional abnormalities of the liver as above likely from
chronic hepatic inflammation / edema.
Now this is the last one prior to my transplant just 2 months before.
Findings:
The visualized portions of the lung bases are unremarkable. The liver is
nodular in contour. Irregular intrahepatic biliary ductal dilatation is
again seen, compatible with history of PSC. This appears increased compared
to prior study from October 20, 2014. The CBD is normal in size and
measures up to 0.4 cm. There is a likely short-segment stricture of the
intrahepatic common bile duct at the level of the bifurcation (series 10
image 17). There is no mass seen in this region. The main portal vein
remains enlarged and is patent. The hepatic veins are patent. No focal
hepatic lesions are identified. Areas of increased signal intensity on
arterial phase images within the right hepatic lobe are favored to be
perfusional in nature. Gallbladder wall thickening is again noted. Replaced
left hepatic artery arising from the left gastric artery.
Splenomegaly is noted, measuring up to 16 cm. Multiple upper abdominal
varices are again seen. There is recanalization of the umbilical vein.
The left kidney is normal in appearance. No right kidney is seen. The
bilateral adrenal glands are unremarkable. The pancreas is normal. No
lymphadenopathy. Umbilical hernia is again seen, which contains fat and a
small amount of fluid. The visualized bowel is otherwise normal.
There are no aggressive osseous lesions.
Impression:
Findings compatible with primary sclerosing cholangitis, with short-segment
stricture of the common bile duct at the level of the confluence and
increased intrahepatic biliary ductal dilatation compared to prior study.
There is no definite mass at the level of the stricture, though a small
mass at this location cannot be entirely excluded. Correlation with ERCP is
recommended. No evidence of portal venous occlusion. Redemonstration of
findings of portal hypertension.
Kind Regards,
Mark