Final answer:
A superscan results from diffuse skeletal metastases, which differs from other conditions like Paget's disease that also affect bone turnover. Paget's disease would show elevated alkaline phosphatase levels and not a uniform superscan pattern.
Step-by-step explanation:
A superscan is commonly associated with diffuse skeletal metastases (b). In this medical context, the term refers to a bone scan that shows a uniform increase in radiotracer uptake throughout the skeleton, which can be linked to widespread metastatic disease. It is important to distinguish this from other conditions that can affect bone turnover. For example, Paget's disease would show an increased uptake in the affected bones, often with focal rather than diffuse patterns, and elevated blood levels of alkaline phosphatase. In contrast, multiple myeloma can lead to renal insufficiency through hypercalcemia or cast nephropathy, but this would not directly result in a superscan appearance.