Abstract <p>Urinary bladder diverticula are common and are frequently incidentally discovered. Many downstream complications can occur due to urinary stasis, such as bladder diverticular stones, infection, and malignancy. Understanding the physiology of bladder diverticula and potential pitfalls and mimics is critical to an accurate description of bladder diverticula and early detection of potential downstream complications. This pictorial review will first review the normal bladder histology and function, bladder diverticular types, and typical imaging features. The paper will then draw attention to technical pitfalls and potential mimics. Finally, we will review the downstream complications, including stones, infection, malignancy, and BCG-related changes.</p> Graphical abstract <p></p>