Which of the following stones is radiolucent on imaging studies?

Uric acid stones are radiolucent on imaging studies, meaning they do not significantly attenuate X-rays and appear less opaque compared to other types of stones. This characteristic is due to their composition, which contains minimal calcium, making them difficult to visualize on standard X-ray films. In contrast, calcium oxalate, struvite, and cystine stones are radiopaque and readily detectable on X-ray due to their higher calcium content or different elemental compositions. Thus, uric acid stones are commonly identified using ultrasound or CT scans, as these modalities can accurately detect them despite their radiolucent nature. Understanding the radiographic characteristics of these stones is crucial for proper diagnosis and management in clinical practice.