Which IVC filter is described as looking like a star from above and a bird cage from the side?

Which IVC filter is described as looking like a star from above and a bird cage from the side?

• A. TrapEase
• B. Greenfield
• C. VenaTech
• D. Birds Nest

Answer: (A)

Understanding how IVC filters appear on radiographs hinges on their geometry. TrapEase has a design with multiple radiopaque struts arranged so that from a top-down view the struts form a star-like pattern. When looked at from the side, the same lattice structure presents a cage-like, bird-cage silhouette. That combination—star from above and bird cage from the side—fits the described appearance. Other filters tend to have different silhouettes: a cone-shaped Greenfield looks like a cone in both views, a nest-like Birds Nest is more nest-shaped in plan view, and VenaTech configurations don’t typically produce that dual star-and-cage profile.

Understanding how IVC filters appear on radiographs hinges on their geometry. TrapEase has a design with multiple radiopaque struts arranged so that from a top-down view the struts form a star-like pattern. When looked at from the side, the same lattice structure presents a cage-like, bird-cage silhouette. That combination—star from above and bird cage from the side—fits the described appearance. Other filters tend to have different silhouettes: a cone-shaped Greenfield looks like a cone in both views, a nest-like Birds Nest is more nest-shaped in plan view, and VenaTech configurations don’t typically produce that dual star-and-cage profile.