Incidental Spinal Magnetic Resonance Imaging Findings in Asymptomatic Young Adults and Military Aircrew Candidates: A Narrative Review

Magnetic resonance imaging (MRI) is highly sensitive for degenerative and structural changes of the spine, and a large body of evidence demonstrates that such findings are common in individuals without symptoms.Their prevalence increases predictably with age from the second decade of life, so that even young, healthy adults frequently harbor incidental degenerative changes.This is of particular importance in military aircrew candidates, who are young, intensively screened, and physically active, yet are about to enter careers in which the spine is exposed to substantial occupational loading.In this population, spinal MRI obtained during selection or aeromedical evaluation commonly reveals incidental findings whose misinterpretation may lead to unnecessary restriction of training or flying duties.This narrative review synthesizes current evidence on the prevalence and anatomical distribution of incidental spinal MRI findings in asymptomatic young adults and aircrew candidates, summarizes the standardized classification of the principal degenerative findings, and examines the well-documented discordance between imaging findings and clinical symptoms.It concludes with a practical framework for the cautious, clinically correlated interpretation of incidental findings that avoids overdiagnosis while ensuring the timely recognition of the small proportion of clinically significant findings, and highlights the value of baseline imaging as a reference for later, occupationally acquired change.