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An uneventful family history lowers suspicion for HCM, prompting more thorough investigation of alternative etiologies. For 18-year-old Patient B (arrow) with mild left ventricular (LV) hypertrophy, 24-hour blood pressure monitoring revealed occult hypertension as the underlying cause. Circles indicate females; squares, males; slash, deceased. HCM = hypertrophic cardiomyopathy.
