Klippel–Trénaunay Syndrome With Pelvic/Rectal and Urinary Bladder Involvement: A Rare Case Report

ABSTRACT Concurrent bladder and rectosigmoid vascular malformations in Klippel–Trénaunay syndrome can mimic synchronous pelvic malignancy. Multidisciplinary clinical, radiological, endoscopic, and pathological evaluation is essential to avoid misdiagnosis and to guide appropriate, often conservative, management.