Endoscopic ultrasound (EUS) is an imaging test that is performed to diagnose gastrointestinal (digestive) and lung disorders. It is a minimally invasive procedure. Endoscopic ultrasound uses the sound waves of high frequency to produce images of the patient’s lining of the gastrointestinal tract and chest, along with some surrounding organs such as liver, pancreas and lymph nodes. Endoscopic ultrasound is sometimes combined with FNAC (Fine needle aspiration cytology), and helps the doctor to take a biopsy tissue sample from the chest or abdomen for further detailed analysis. This combined procedure of Endoscopic ultrasound and biopsy is also a minimally invasive procedure and is not an exploratory surgery. The endoscopic ultrasound procedure is an effective technique and is helpful in some other treatments like drainage of a pseudocyst. Endoscopic ultrasound procedure consists of a small ultrasound device installed at the head or tip of an endoscope (a small tube-like structure, flexible in nature with a light fitted in it). Endoscopic ultrasound is a safe procedure that helps in diagnosing various problems at an early stage.