This study uses a systematic scoring method combined with clinical and ultrasound data to comprehensively evaluate patient conditions and explore the guiding value of the ultrasound quantitative scoring system for selecting the surgical approach for caesarean scar pregnancy.

Inclusion Criteria:

• history of at least one previous caesarean section
• symptoms suggestive of caesarean scar pregnancy, such as unexplained abnormal vaginal bleeding, abdominal pain, cervical pain or abnormal uterine activity during pregnancy
• amenorrhea ≤84 days
• ultrasound examination suggesting a single gestational sac with intact morphology
• stable maternal vital signs

Exclusion Criteria:

• mass-type caesarean scar pregnancy
• previous medication or surgical treatment before ultrasound examination
• haemodynamically unstable patients
• patients with surgical contraindications
• incomplete or lost follow-up clinical data
• patients with severe medical conditions such as hypertension, diabetes, hyperthyroidism and haemophilia

A total of 117 patients with caesarean scar pregnancy admitted to the Obstetrics and Gynecology Inpatient Area of Chengde Central Hospital, China, from January 2019 to December 2022 were selected for this study.