Despite extraordinary advances in diagnostic laboratory investigations and modern radiography imaging the accurate preoperative diagnosis of acute appendicitis remains a challenge.  Commonly used diagnostic aids for appendicitis are diagnostic scores, USG, CT abdomen and laparoscopy. By using diagnostic aids for acute appendicitis, prolonged observation, negative appendicectomy and incidence of perforation can be reduced dramatically resulting in decreased financial cost of the systems employed. USG has various advantages being the most suitable modality in recognition of acute appendicits .we present a study of 100 patients which were suspected of acute appendicitis purely on clinical basis,ultrasound suggested that majority of the case of acute appendicitis had a diameter between 7–9 mm.