Background: Ovarian cysts are a common gynecological problem that affects a high percentage of females, particularly during puberty. While majority of ovarian cysts are asymptomatic and frequently resolve spontaneously, some may become large causing several complications. The use of ultrasound is considered the best method for early detection of ovarian cysts, which is critical in determining whether early intervention is necessary.

Aim: To assess Incidence of ovarian cysts in adolescente girls complaining of lower abdominal pain and /or menstrual disturbance in Zagazig University Hospital.

Methods: This cross-sectional prospective study was conducted at Ultrasound and Fetal Medicine Unit and Gynecology Outpatient Clinic at Zagazig University Hospital on 150 adolescent girls presented to either outpatient clinic or emergency unit with the following inclusion criteria age started from 10 to 19 years, with lower abdominal pain and /or menstrual disturbance.

Results: Lower abdominal pain was presented in 60.7% of cases and associated symptoms of the studied patients were fever in 4.4%, 1ry Amenorrhea (imperforate hymen) in 1.1% and vaginal discharge and itching in 23.08%. Among studied patients, ovarian cyst was detected in only 25 (16.67%) patients. Simple cyst was detected in 56% of cases.

Conclusion: The incidence of ovarian cysts in adolescent girls presenting with lower abdominal pain and/or menstrual disturbances was 16.67%. These cysts were associated with various symptoms, including dysmenorrhea, lower abdominal pain and menstrual irregularity. The most common type of cyst observed was a simple cyst. Fortunately, the majority of patients experienced resolution of their symptoms, indicating a favorable outcome.