title: Subcutaneous hydatid cyst in the popliteal fossa at the site of a previous wasp sting.
abstract: We report an uncommon case of a primary Echinococcus cyst that developed in the subcutaneous tissue of the right popliteal fossa, at the spot of a previous wasp sting, suggesting the possibility of an unusual transmission of the eggs by insects. This unusual presentation was initially considered as a Baker cyst until parasytological results verified Echinococcus hydatidosus, the larval form of Echinococcus granulosus, as diagnosis. However, the most common path of Echinococcus granulosus infection is through contact with a definitive host or by ingestion of ova through contaminated water or food. Transmission by insects should also be reconsidered in endemic areas.
authors.affiliation: Department of Radiology, Medical University of Pécs, Pécs, Hungary. istvan.battyany@aok.pte.hu
authors.forename: Istvan
authors.initials: I
authors.lastname: Battyany
authors.forename: Levai
authors.initials: L
authors.lastname: Andrea
authors.forename: Karoly Kalmar
authors.initials: KK
authors.lastname: Nagy
mesh_terms: D000818:Animals; D003937:Diagnosis, Differential; D004443:Echinococcosis / Q000000981:diagnostic imaging* / Q000469:parasitology / Q000601:surgery; D006801:Humans; D007299:Insect Bites and Stings; D007717:Knee / Q000000981:diagnostic imaging* / Q000469:parasitology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D012086:Reoperation; D040521:Subcutaneous Tissue / Q000000981:diagnostic imaging / Q000469:parasitology / Q000601:surgery; D014463:Ultrasonography; D014863:Wasps