الفهرس 
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Abstract
Cesarean section rate is increasing in recent practice. Women delivered by cesarean section are prone to some complications, one of which is the presence of a uterine niche which is defined as any uterine dimpling 2 mm or more at the cesarean scar site that could be visualized by ultrasound.
Women with uterine niches might complain of pelvic pain, postmenstrual spotting or dysmenorrhea. It could be related to cesarean scar pregnancy or it could be implicated in decreased fertility.
Many expressions were used to define the defect that is seen by ultrasound after cesarean section namely a scar defect, niche, isthmocele, uterine pouch or diverticula.
The shape of the cesarean scar by ultrasound may be significant, but there is limited proof to correlate the appearance of the scar with the function. There is also concern about the possibility of implantation within the scar and the association with abnormal uterine bleeding and subfertility.Aim of work
The aim of this study is to Compare between office Hysteroscopy and 3D Transvaginal Ultrasound in assessment of Caesarean Section Scar.
Patients and methods
The present study was carried out as a prospective one that was conducted on 30 patients with previous caesarean section scar attending to Department of Obstetrics and Gynecology, Tanta University Hospitals in the period from December 2018 till May 2019.
Inclusion Criteria
5. Non pregnant females.
6. Age from.20 to 35 years old.
7. Body mass index 24.9 - 30 kg
8. Patients are assessed post menstrual 5-7 days.
Exclusion Criteria
5. Womens with any vaginal bleeding .
6. Women with vaginal infection .
7. Women with any focal lesion such as: adenomyosis, endometrial, polyp, endometrial hyperplasia or fibroids is reported.
8. Womens with any medical illness e.g DM, HTN and bleeding disorders.
Methodology
All the patients were subjected toI. Medical history review includes: age, parity, number of previous cesarean section, the indication for previous section , menstrual history for proper dating, the patients were systemically asked about.