PURPOSE: Isolated extrarenal retroperitoneal echinococcal cyst is a rare manifestation of @entity66 . We review the clinical findings of a series of isolated retrovesical and retroperitoneal hydatid cysts in an endemic area, with special emphasis on diagnostic pitfalls. MATERIALS AND METHODS: A retrospective 15-year review in a rural area of central Spain (600,000 population), with a global incidence of @entity8434 of 10 new cases per 100,000 population per year, revealed 10 @entity1 (0.1 cases per 100,000 per year) with surgically treated primary @entity8434 and absence of other hydatid cysts in any organ. Clinical, radiological and laboratory data are analyzed. The literature of the last 15 years on @entity66 with a primary retroperitoneal and retrovesical location is reviewed. RESULTS: A total of 42 cases of isolated retrovesical (25) and retroperitoneal (17) @entity8434 was compiled. Male predominance of 2.5:1 was noted and age ranged from 8 to 79 years (mean 42.2 +/- 5.4). The most frequent presentation was a palpable mass in 29% of the cases followed by @entity812 in 24%, frequency in 17% and urinary retention in 14% of the cases. Hydatiduria of the urinary tract was present in 9.5% of the cases. Different serological investigations were performed in 45% of the cases with positive results in 68%. The lesion had been surgically removed in all cases. Therapy and followup of each @entity1 were analyzed. CONCLUSIONS: An isolated retrovesical, retroperitoneal or even retrocrural cyst can be the unique manifestation of @entity66 . Although difficult, preoperative diagnosis is desirable for the selection of a surgical approach and prevention of @entity56 and @entity7441 . A diagnostic algorithm and several therapeutic guidelines are proposed.

Isolated retrovesical and extrarenal retroperitoneal XXXX : clinical study of 10 cases and literature review.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity66 :: ('MESH:D004194', 'Disease') :: ['hydatid disease'] @entity812 :: ('MESH:D021501', 'Disease') :: ['flank pain'] @entity8434 :: ('MESH:D004443', 'Disease') :: ['hydatidosis', 'extrarenal retroperitoneal echinococcosis'] @entity56 :: ('MESH:D004342', 'Disease') :: ['allergic reactions'] @entity7441 :: ('MESH:D056987', 'Disease') :: ['operative spillage']
@entity8434 :: (MESH:D004443,Disease) :: ['hydatidosis']
