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Although secondary affection of visceral organs is possible extrahepatic AE is highly uncommon. Moreover, the involvement of bone and muscle presents with an even lower incidence. In the literature numerous cases on hepatic AE have been reported. However, extrahepatic AE involving bones and\/or muscles was described very rarely. We report a case of an 80-year-old man with primary extrahepatic alveolar Echinococcosis of the lumbar spine and the psoas muscle. The etiology, diagnosis, differential diagnoses, treatment options and outcome of this rare disease are discussed in context with the current literature.<\/jats:p>","DOI":"10.1186\/1476-0711-10-13","type":"journal-article","created":{"date-parts":[[2011,4,21]],"date-time":"2011-04-21T06:14:21Z","timestamp":1303366461000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Primary extrahepatic alveolar echinococcosis of the lumbar spine and the psoas muscle"],"prefix":"10.1186","volume":"10","author":[{"given":"Manuel","family":"Nell","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rainer H","family":"Burgkart","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guntmar","family":"Gradl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u00fcdiger","family":"von Eisenhart-Rothe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Schaeffeler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dennis","family":"Trappe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clarissa Prazeres","family":"da Costa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reiner","family":"Gradinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chlodwig","family":"Kirchhoff","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2011,4,15]]},"reference":[{"key":"216_CR1","doi-asserted-by":"publisher","first-page":"1420","DOI":"10.1099\/jmm.0.2008\/002816-0","volume":"57-Pt 11","author":"D Tappe","year":"2008","unstructured":"Tappe D, Weise D, Ziegler U, Muller A, Mullges W, Stich A: Brain and lung metastasis of alveolar echinococcosis in a refugee from a hyperendemic area. 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