Background: Non-compaction cardiomyopathy is a rare cardiomyopathy, until now, not fully clarified. Diagnosis remains difficult since there are similarities with other cardiac defects, clinical manifestations are non-specific and echocardiographic criteria are not universally accepted. As a consequence diagnosis may be easily missed. We present a clinical case of previously healthy and asymptomatic boy, misdiagnosed as dilated cardiomyopathy. Case Report: A 13-year-old previously healthy boy presented with a 2 day of abdominal pain after being hit by his friend. Physical examination showed signs of congestive cardiac failure. Echocardiography and cardiac MS-CT were consistent with the diagnosis of non-compaction cardiomyopathy. Conclusion: Our purpose with this case report was to point out attention to this entity as an important and often misdiagnosed cause of dilated cardiomyopathy.