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This is an Iodine-123 MIBG study of a young child with metastatic neuroblastoma who has had treatment. There is physiological uptake diffusely within the soft tissues, as well as the salivary glands, heart, liver and bowel. There is an additional focal site of tracer uptake within the mediastinum (arrow). Of note, the tracer retention within the bladder has been masked out.
