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Fig. 4D —18-year-old woman with incidentally found left ventricular
noncompaction after insertion of two Amplatzer septal occluders (AGA Medical
Corporation), one of which is relatively large. See also Figs. S4E and S4F,
cine loops, in supplemental data. MDCT image of short axis of left ventricle
shows prominent left ventricular trabeculation (black arrows),
prominent noncompaction (NC) layer (long white arrow), and thin
compaction (C) layer (short white arrow). Ratio of noncompaction
layer to compaction layer is greater than 2, which meets criterion for
diagnosis of left ventricular noncompaction. This rare cardiomyopathy is
difficult to recognize even retrospectively on transthoracic echocardiography.
Because disease is inherited, family screening was undertaken and showed same
disorder in patient's 15-year-old brother. LV = left ventricle, RV = right
ventricle.
