Background <p>A rare case of cesarean scar diverticulum located deep to the anterior lip of the cervix treated by combined hysteroscopy and laparoscopy.</p> Case presentation <p>We present a special case report of a patient with cesarean scar diverticulum who was diagnosed as having a cervical mass.</p> Subjects <p>A 33-year-old female patient was admitted to our gynecological emergency due to abnormal uterine bleeding that lasted for two weeks and aggravated for one day. A suspected cervical mass detected by ultrasound examination in several hospitals. No specific lesions were found through cervical biopsy. Finally, she was diagnosed with a special cervical cesarean scar diverticulum via magnetic resonance imaging and surgical exploration. The pathology results obtained from the procedure confirmed the diagnosis of a diverticulum within the cervical myometrium.</p> Conclusions <p>Diverticulum within the cervical myometrium is extremely rare and can easily lead to misdiagnosis. Magnetic resonance imaging is useful for differential diagnosis. Laparoscopy combined with hysteroscopy is feasible and reasonable for the closure of the diverticulum without leaving dead space.</p>