Leiomyosarcoma ist the most common mesenchymal malignant tumor of the
urinary bladder in adults. 91 cases have been reported so far. We pres
ent an additional case of a 77-year-old woman without any previous uro
logic or oncologic illness who was diagnosed to suffer from a giant le
iomysarcoma filling the whole bladder. Diagnosis, treatment and progno
sis of this rare malignancy is discussed on the basis of a literature
review.