focal nodular hyperplasia (FNH)

focal nodules of normal hepatocytes, Kuppfer cells + bile ducts

F > M
rare, benign
multiple in 20%
hemorrhage (most common complication) in only 2-3%
(unlike hepatic adenoma)
stellate fibrous septae ("stellate scar")
NM: normal or increased uptake on HIDA and sulfur colloid
MR: lesions usually hypointense to liver on T1 and T2 (scar maybe hyperintense on T2)

Charles E. Kahn, Jr., MD - 2 February 1995
Last updated: 1 October 2013