Needle aspiration is a medical procedure used to collect fluid or tissue samples from a specific area of the body. A thin, hollow needle is inserted into the target area, often guided by imaging techniques like ultrasound or CT scans. This method is commonly used to diagnose conditions such as infections, cysts, or tumors. The procedure is typically performed on an outpatient basis and may require local anesthesia to minimize discomfort. After the sample is collected, it is sent to a laboratory for analysis. Results can help doctors determine the best course of treatment for the patient.