Incidence
Age
Sex
Geography
Aetiology	- Echinococcus granulosus - single or multiple cysts in lower part of right lower lobe - 3 layers; outer layer from host, intermediate lamiated layer, inner germinal layer buds off brood capsules -> daughter cysts
Presentation	- may be asymptomatic - may be dull ache and swelling in right hypochondrium
Investigations	FBC - peripheral eosinophilia in 30% - positive hydatid complement fixation test or haemagglutination - 85% AXR - may show calcification of outer coat of cyst USS / CT - cysts; daughter cysts existing within parent cyst are diagnostic
Macro
Micro
Staging
Serum markers
Management	Medical - albendazole can reduce cyst size FNA under ultrasound guidance with chemotherapeutic cover Surgery with removal of (hopefully) intact cyst following sterilization with formalin or ETOH - chronic, calcified cysts can be left Preventative - deworm pet dogs - prevent pets from eating infected carcasses
Prognosis	- good if no comlications
Complications	- rupture - 2º infection - involvement of other organs

Hepatobiliary medicine

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