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

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.