Bone Regrowth After Sigmoid Sinus Diverticulum and Emissary Vein Coiling

Mechanistic Insight

• Coiling of a sigmoid sinus diverticulum and its associated emissary mastoid vein is expected to eliminate turbulent flow and abnormal hemodynamic stress on the adjacent sigmoid plate, thereby creating conditions that may permit bone regeneration. 1

Imaging Surveillance (American College of Radiology recommendation)

• Perform serial high‑resolution CT of the temporal bone with thin‑section bone‑window reconstructions to evaluate for bone regrowth after the endovascular procedure. Suggested schedule:

Expected Timeline of Regrowth (based on CT findings)

• Initial bone formation may become visible on CT as early as 6 months after coiling. 2
• Progressive increase in bone density is typically observed by 12 months, with mature cortical bone and hardened edges often evident by 24 months. (This timeline is extrapolated from cases with upstream transverse sinus stenosis treatment.) 2