In a voiding cystourethrography, which part of the body is primarily examined?

Voiding cystourethrography is a specialized radiological procedure that specifically examines the bladder and the urethra during the process of urination. This imaging technique involves filling the bladder with contrast material and then taking X-ray images to assess the anatomy and functionality of these structures. It is particularly useful for diagnosing conditions such as urinary tract infections, bladder stones, or anatomical abnormalities of the urinary system.

The other options, while representing important organs, do not relate to the specific focus of a voiding cystourethrography. The lungs are examined through pulmonary imaging techniques, the heart is evaluated in cardiac imaging, and the stomach would be viewed using gastrointestinal studies. Therefore, the bladder is the correct focus of examination in this procedure.