The Diagnosis That Arrived Decades Late: Living Without and Then With Myhre Syndrome

ABSTRACT Myhre syndrome (MIM #139210) is a rare multisystem disorder first described in 1981, characterized by short stature, neurodevelopmental delay, joint contractures, and cardiopulmonary complications. Its molecular basis, recurrent pathogenic variants in SMAD4, was not discovered until 2011. This narrative is based on a review of medical records, personal experiences in the care of a remarkable patient, and family interviews. It traces the life of a young man from rural Montana whose diagnosis was delayed for over two decades, despite early evaluations by renowned specialists. The absence of a unifying diagnosis profoundly shaped his and his family's experience—emotionally, medically, and socially. When the diagnosis of Myhre syndrome was finally established via whole exome sequencing in adulthood, it brought both clarity and new uncertainties. Through his story, we examine the psychosocial toll of diagnostic delay, the transformative potential of genomic medicine, and the resilience of individuals and families living with complex, undiagnosed conditions. The narrative also underscores the ongoing systemic barriers to care and inclusion for individuals with