Management of Septated Hepatic Cysts

Diagnostic Approach

The American Association for the Study of Liver Diseases recommends obtaining an MRI to characterize septated hepatic cysts and assess for worrisome features that would suggest a mucinous cystic neoplasm (MCN) requiring surgical resection, with a specificity of 94-98% when multiple features are present 1, 2
MRI is the preferred modality for characterizing septated hepatic cysts, as it is more accurate than CT in identifying worrisome features, with a specificity of 94-98% when multiple features are present 1, 2
The combination of >1 major feature (such as thick septations or nodularity) PLUS >1 minor feature (such as upstream biliary dilatation, thin septations, internal hemorrhage, perfusional changes, or fewer than 3 coexistent hepatic cysts) carries 94-98% specificity for MCN and warrants surgical resection 1, 2

If MRI shows worrisome features (≥1 Major + ≥1 Minor), proceed directly to surgical resection with complete excision, as this is the gold standard for suspected MCNs, with a risk of invasive carcinoma of 3-6% and high recurrence rates with incomplete resection 6, 2, 3
If MRI shows simple cyst with hemorrhage, conservative management is appropriate, with presentation typically including heterogeneous hyperechoic mobile material (clots) on ultrasound, hyperintense internal septations on T1-weighted MRI, and lack of enhancement on contrast-enhanced ultrasound 4, 5

MCNs predominantly occur in middle-aged women and typically present in the left liver lobe, with symptoms in 86% of cases (pain, fullness, early satiety), and tumor markers CEA and CA 19-9 may be elevated in MCNs, particularly with invasive carcinoma 1, 3