Renal fusion is a medical condition where two kidneys are joined together, forming a single, larger kidney. This condition can occur during fetal development and is often detected through imaging techniques like ultrasound. The fused kidney may have a normal function, but it can also lead to complications such as urinary obstruction or hypertension. The most common type of renal fusion is known as horseshoe kidney, where the kidneys are connected at their lower ends. While many individuals with renal fusion may not experience significant health issues, some may require monitoring or treatment to manage any associated complications.