What examination technique is useful in primary care for evaluating for acute sinusitis or hydrocele?

Transillumination is a useful examination technique in primary care for evaluating conditions like acute sinusitis and hydrocele. This technique involves directing a strong light source through a body structure to assess for abnormalities. In cases of hydrocele, the fluid in the scrotum will allow light to pass through, indicating the presence of fluid, while a solid mass will obstruct the light. Similarly, in acute sinusitis, transillumination can help to assess the sinuses; if the sinus cavities are filled with fluid, they will not transilluminate well, providing a visual cue suggesting infection or blockage. This technique is quick, non-invasive, and can be performed in an office setting, making it ideal for primary care evaluations.