What does a halo from transillumination indicate?

A halo observed during transillumination typically indicates the presence of fluid, such as in cases of a cyst or abscess. The halo effect occurs when light passes through a fluid-filled structure, creating a ring-like appearance around the area of interest. This finding can help differentiate between solid and fluid-filled lesions in diagnostic imaging. It's important for clinicians to consider other clinical findings and imaging results for accurate diagnosis.