School ager with gross hematuria who is post bone marrow transplant and has received cyclophosphamide Pediatric Imaging Gastrointestinal September 9, 2021August 31, 2021 Transverse (above) and sagittal (below) US of the pelvis shows an extremely thick-walled bladder containing echogenic debris and clots. The diagnosis was hemorrhagic cystitis due to cyclophosphamide therapy. Related Published September 9, 2021August 31, 2021