Hepatic cysts lesions
Autosomal Dominant Polycystic Kidney Disease (ADPKD)
In autosomal dominant polycystic kidney disease (ADPKD), the liver is the most common extrarenal organ in which cysts occur. It is estimated that up to 75% of patients with ADPKD have hepatic involvement. Although these cysts vary in number and size, they tend to be multiple and smaller than the renal cysts, measuring up to 4 cm. However, extensive hepatic replacement with large cysts has been described. Liver cysts in the setting of ADPKD exhibit the same MR features as simple cysts. Occasionally, hemorrhage may be observed in cysts (Mosetti et al. 2003).
Biliary hamartomas (or von Meyenburg complexes) are benign biliary malformations, which are currently considered part of the spectrum of fibropolycystic diseases of the liver due to ductal plate malformation. On MR images, lesions are small (usually <1 cm) and well defined. The high fluid content gives these lesions markedly high signal intensity on T2-weighted images, low signal intensity on T1-weighted images, and faint rim enhancement on early and late post-gadolinium images (Semelka et al. 1999b).