Every time you look at a pediatric image, the most dangerous question is not "what is this?" — it is "is this normal for this child's age?" When adult interpretive frameworks get applied to the developing patient, the consequences are real: a thymic sail sign triggers a PET scan, a normal periventricular halo becomes a leukodystrophy workup, a physiologic C2 pseudosubluxation gets immobilized, and a posterior interhemispheric subdural hemorrhage goes home with a child who is not safe. This handbook gives you a systematic, age-keyed decision framework that replaces interpretive guesswork with developmental precision — at the reading workstation, in the NICU, and in the emergency bay. Inside this handbook: • The Variant-vs-Pathology Discriminator System — sixty-one age-anchored clinical decision entries telling you exactly what separates normal from pathological across every organ system and developmental stage • CRITOE and elbow trauma logic — the systematic sequence that eliminates the most litigated misread in pediatric musculoskeletal imaging • Neonatal HIE pattern recognition — DWI timing windows, central versus watershed injury patterns, and the PLIC T1 signal finding that predicts motor outcome • Non-accidental trauma protocol — posterior rib fractures, classic metaphyseal lesions, the OI differential, and what imaging can and cannot establish about fracture dating • Fetal imaging decision anchors — banana and lemon signs, mild ventriculomegaly workup, placenta accreta spectrum grading, and vasa previa identification before membrane rupture • Pediatric oncologic staging — COG PRETEXT, INRGSS image-defined risk factors, neuroblastoma IDRFs, and pseudoprogression versus true tumor progression on post-radiation MRI • The Master Discriminator Atlas — every decision anchor from all twenty-one chapters indexed by organ system, developmental stage, and presenting imaging appearance for rapid point-of-care lookup This handbook is written for radiology residents, pediatric radiology fellows, general radiologists reading pediatric studies in mixed practice, and any clinician who needs imaging decision support at the level of the developing patient. Every child on your worklist deserves an interpreter who understands their age — make that commitment now.
