Complex Blood Supply Patterns in Cesarean Scar Pregnancy: Insights from Digital Subtraction Angiography Imaging.

BACKGROUND Understanding the blood supply pattern of cesarean scar pregnancy (CSP) can effectively help to determine the best choice of treatment. The aim of this study was to investigate the blood supply pattern and outcomes of patients with CSP through digital subtraction angiography (DSA) imaging. MATERIAL AND METHODS This was a retrospective cohort study. Patients were divided into 2 groups according to the type of CSP. The DSA images of these patients were reviewed, including the type of blood supply, dominant vessel, and collateral blood supply to the gestational sac. The clinical outcomes were analyzed between the 2 groups. RESULTS Thirty-seven patients with type I and 29 patients with type II CSP were enrolled in this study. Type II CSP showed a higher proportion of rich blood supply than type I (44.83% vs 29.72%, P>0.05). Compared with type II CSP, type I CSP tended to have bilateral dominant blood supply predominance (67.57% vs 41.38%, P<0.05). The incidence of collateral blood supply was 5.41% in the type I CSP group and 31.03% in the type II CSP group (P<0.05). In the type II CSP group, multiple collateral blood vessels were found in 4 patients. The superior vesicle artery was the most common source of collateral blood supply in both groups. Two patients with type II CSP suffered massive bleeding during surgery after uterine artery embolization (UAE). None of the patients received a hysterectomy. CONCLUSIONS UAE is safe and effective for both types of CSP. The blood supply pattern is more complex and abnormal in type II CSP. More attention should be paid to the collateral blood supply to achieve complete embolization during the UAE procedure in the case of type II CSP.