Dynamic three-dimensional spiral computed tomographic cysto-urethrography: a novel technique for evaluating...

Area of Science:

• Urology
• Radiology
• Surgical Anatomy

Background:

• Conventional two-dimensional cysto-urethrography (CUG) may lead to misinterpretations of posterior urethral distraction defect (PUDD) anatomy.
• Accurate anatomical identification is crucial for effective surgical planning and reconstruction of PUDDs.

Purpose of the Study:

• To introduce and evaluate a novel three-dimensional spiral computed tomography/cysto-urethrography (CTCUG) technique for PUDD assessment.
• To demonstrate the advantages of CTCUG over conventional CUG in defining PUDD characteristics.

Main Methods:

• Twenty-one patients with PUDDs underwent conventional ascending and micturating CUG (ACUG) followed by CTCUG.
• CTCUG involved specialized software to subtract soft tissues, creating high-density images of bony structures and the contrast-filled urinary tract.
• Images were analyzed dynamically and statically from 36 different viewing angles using 'roll and spin' techniques.

Main Results:

• CTCUG provided 360-degree visualization of PUDDs, enabling precise anatomical evaluation.
• This technique allowed for more thorough assessment of PUDD location, length, urethral end-alignment, and relationship to bony structures.
• CTCUG effectively identified associated pathological defects such as fistulae, false passages, and diverticulae, surpassing ACUG in diagnostic capability.

Conclusions:

• Three-dimensional spiral computed tomography/cysto-urethrography (CTCUG) facilitates easier staging of PUDDs through static and dynamic imaging.
• The enhanced anatomical detail provided by CTCUG leads to improved surgical planning and better reconstructive outcomes for patients with PUDDs.