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Published Online:https://doi.org/10.1176/ps.50.7.966

The authors report an unusual presentation of amnestic syndrome mislabeled as malingering in a man with mild developmental disability. The case highlights the challenges to medical personnel in treating persons who visit emergency rooms often, particularly individuals with mental retardation. Diagnostic overshadowing was a primary factor in the failure to diagnose amnestic syndrome. Overshadowing occurs when a patient's problematic behaviors are attributed to mental retardation, and no attempt is made to search for the root causes of the problem. The case also highlights the need for emergency room personnel to maintain links with agencies involved in the day-to-day care of persons with developmental disabilities.