CTICasesRiata ICD Lead Conductor Externalization
Imaging findings
PA and lateral chest radiographs show spacing out and protrusion of internal conductor wires outside the primary silicone insulation body of a Riata defibrillator (ICD) lead, representing conductor externalization.
Key takeaways
Conductor externalization is a known design flaw in older Riata ICD leads, caused by the cables wearing through the silicone insulation from the inside out ('inside-out abrasion'). Radiologists should carefully inspect Riata leads for externalized cables on both frontal and lateral radiographs to prevent lead failure.
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