GU – Collecting Systems, Ureters & Bladder
- What is the Current Role of CT Urography and MR Urography in the Evaluation of the Urinary Tract?
- CT Urography
- Transitional Cell Carcinoma of the Upper Urinary Tract: Spectrum of Imaging Findings
- CT Findings in Urinary Diversion after Radical Cystectomy: Postsurgical Anatomy and Complications
- Neoplasms of the Urinary Bladder: Radiologic-Pathologic Correlation
- Usefulness of Hounsfield unit and density in the assessment and treatment of urinary stones Key Points
“For a stone > 4 mm a HU ≤ 500 and pH ≤ 5.5 had a positive predictive value of 90% for uric acid composition.”
“They examined 184 cases, and calculated that 498.5 HU was the appropriate cut-off value for determining if a stone > 4 mm was radio-opaque or radiolucent, with 89.3% sensitivity and 87.3% specificity”
“Hameed et al reported that successful fragmentation using ESWL was decreased in stones with HU > 1350, which required application of more shock waves. El-Assmy et al used the Hounsfield value of the stones to predict stone composition and density, and the fragmentation success using ESWL, and selected HU > 1000 as their cut off value.”
“Ouzaid et al performed a prospective study on 50 patients, and reported that a HU threshold of 970 was predictive of successful ESWL.”