It is important for patients to inform their healthcare provider if they have any bleeding disorders or are taking blood-thinning medications, as this may increase the risk of bleeding during the procedure. Patients should also inform their healthcare provider if they have any allergies or are pregnant. During the procedure, an ultrasound technician will use an ultrasound machine to visualize the area being aspirated, and a healthcare provider will use the images to guide the insertion of a needle into the area. Once the needle is in place, fluid or tissue samples can be removed and sent to a laboratory for further analysis.