Starship Paediatric Radiology
If there is a tract or connection from the skin into the body caused by infection, or created by surgery, it may be necessary to outline the tract with contrast - the same iodinated contrast medium that is used in vascular studies - before treatment or further surgery is performed.
A small catheter is placed into the hole in the skin and a clear fluid, which is visible on x-ray images, is injected into the tract. This is done with fluoroscopy (screening) so that images can be taken, and the child moved into different positions to outline the tract and the organ(s) with which it communicates.
Typically, no preparation is needed for this examination.