Multiple reports describe the case of Callum Renton, who initially experienced sudden, severe back pain and assumed it was a muscle strain. The articles say doctors advised that he was not overly concerned at first, despite observations later described as “bubbles” in his urine. Renton’s condition reportedly goes undiagnosed for about ten months, with an accurate diagnosis reached only after ongoing symptoms and medical evaluation. After the correct diagnosis, he is said to have been placed on a transplant waiting list. The coverage frames the story as an illustration of the importance of paying attention to warning signs, including urinary abnormalities and persistent pain, while also emphasizing that delayed diagnosis can affect the course of treatment. The articles do not provide additional clinical details about the specific disease or the exact transplant type in the provided text. Overall, the sources agree on the timeline: initial self-attribution of back pain, early reassurance from clinicians, a protracted period before definitive diagnosis, and subsequent progression to transplant waiting list status.