Pediatric PET/MR Image Registry

This registry study is collecting combined PET/MRI scan images from children with solid tumors to build a database that helps researchers understand how these scans can improve cancer diagnosis and treatment planning in young patients. **You may be eligible if...** - Your child has a confirmed solid tumor or a newly found mass that is strongly suspected to be a solid tumor - In some cases, children with leukemia who have a suspicious spot in an organ may also be included - Parents (for children under 18) or the patient (if 18 or older) consent to sharing images with the registry **You may NOT be eligible if...** - Your child has a brain (central nervous system) primary tumor - Your child has a pacemaker, metal implants in the brain/skull, or a blood sugar level that is too high for PET scanning - Parental consent cannot be obtained - Your child is pregnant Talk to your doctor to see if this trial is right for you.