The Daily Diff for today relates to a common finding: a low density liver lesion representing a cyst. While the majority of these will be simple, benign cysts, being able to differentiate the other possible entities is worthwhile. Sorry, no mnemonic here, but here are the other possibilities:
| Disease | Notes |
| Simple hepatic cyst | most common (up to 10% of population |
| Pyogenic cyst | thickened enhancing wall; gas present (20%); septic patient |
| Amebic cyst | solitary; right lobe; enhancing thickened wall *and* surrounding parenchyma (double-rim target appearance) |
| Hydatid cyst | caused by Echinococcus; thickened wall with calcifications; layering debris (hydatid sand); often multilocular with daughter cysts (spokewheel appearance) |
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Simple hepatic cyst (they can be huge!)
Source: Radiopaedia |
References:
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