title: [Exceptional retroperitoneal tumor. Ectopic spleen].
mesh_terms: D000015:Abnormalities, Multiple / Q000175:diagnosis; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000601:surgery; D012737:Sex Factors; D013154:Spleen / Q000002:abnormalities*; D013156:Splenectomy
vernacular_title: Une tumeur rétro-péritonéale exceptionnelle La rate ectopique