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Abstract
BACKGROUND: Superficial serosal uterine varicosity (SSUV) is a rare anomaly commonly seen in non-pregnant individuals, and its presence in pregnancy is seldom reported. Here we present a case of SSUV that was accidentally discovered during an elective Cesarean delivery, causing unexpected bleeding. CASE PRESENTATION: A 30-year-old pregnant woman at 37 weeks of gestation with three previous Cesarean deliveries attended our clinic for an elective appointment; her past medical and surgical history was unremarkable. Laboratory investigations were normal, and Doppler ultrasound showed a fundo-anterior placenta, normally situated, with no signs of placenta accreta. During an otherwise uneventful surgery, a brisk haemorrhage occurred near the incision site following complete placental delivery. A dilated tortuous vein was identified as the bleeding source, and hemostasis was secured by ligation and oxytocic drugs. CONCLUSION: SSUV is an uncommon cause of bleeding during Cesarean delivery; as it escapes antenatal imaging, it imposes diagnostic challenges and increases bleeding and transfusion demands.
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Copyright (c) 2026 Wassan Nori, Maryam Abduljabbar Hammood, Manal Madany Abdalqader, Ahmed Atia

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References
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- Massri N, Loia R, Sones JL, et al. Vascular changes in the cycling and early pregnant uterus. JCI Insight. 2023;8(11):e163422. doi:10.1172/jci.insight.163422
- Adu-Bredu TK, Owusu YG, Owusu-Bempah A, et al. Absence of abnormal vascular changes on prenatal imaging aids in differentiating simple uterine scar dehiscence from placenta accreta spectrum: a case series. Front Reprod Health. 2023;5:1068377. doi:10.3389/frph.2023.1068377
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- Bohlmann MK, Rath W. Medical prevention and treatment of postpartum hemorrhage: a comparison of different guidelines. Arch Gynecol Obstet. 2014;289(3):555-67. doi:10.1007/s00404-013-3079-2
- Cao P, Ji L, Zhang S, Qiao C. Risk factors and prediction model for massive transfusion during cesarean section in singleton pregnancies with anterior placenta previa, prior cesarean and prenatal suspicion of placenta accreta spectrum: a retrospective case-control study. BMC Pregnancy Childbirth. 2025;25(1):910. doi:10.1186/s12884-025-08041-w
References
Matsumoto MM, Caridi TM. Uterine vascular anomalies: management and treatment overview. In: Seminars in Interventional Radiology. 2023 Aug;40(4):342-348. Thieme Medical Publishers, Inc. doi:10.1055/s-0043-1770714
Massri N, Loia R, Sones JL, et al. Vascular changes in the cycling and early pregnant uterus. JCI Insight. 2023;8(11):e163422. doi:10.1172/jci.insight.163422
Adu-Bredu TK, Owusu YG, Owusu-Bempah A, et al. Absence of abnormal vascular changes on prenatal imaging aids in differentiating simple uterine scar dehiscence from placenta accreta spectrum: a case series. Front Reprod Health. 2023;5:1068377. doi:10.3389/frph.2023.1068377
Gastañaga-Holguera T, Gesto IC, Gómez-Irwin L, et al. Differential diagnosis of uterine vascular anomalies: uterine pseudoaneurysm as a cause of massive hemorrhage. World J Clin Cases. 2025;13(9):99671. doi:10.12998/wjcc.v13.i9.99671
Nguessan KL, Mian DB, Aissi GA, et al. Spontaneous rupture of uterine varices in third-trimester pregnancy: an unexpected cause of hemoperitoneum. Case report and literature review. Clin Exp Obstet Gynecol. 2013;40(1):175-7. Available from: https://pubmed.ncbi.nlm.nih.gov/23724540/
Jang JH, Kyeong KS, Lee S, et al. A case of spontaneous hemoperitoneum due to uterine vessel rupture in pregnancy. Obstet Gynecol Sci. 2016;59(6):530-3. doi:10.5468/ogs.2016.59.6.530
Rokhgireh S, Kashi AM, Kermansaravi M, et al. Hemoperitoneum due to bleeding from a vein overlying a subserous uterine myoma: a case report. J Med Case Rep. 2020;14(1):55. doi:10.1186/s13256-020-02375-z
Yu HT, Cheung HHC, Chan JCY, et al. Haemoperitoneum secondary to rupture of a superficial vein on a subserosal uterine fibroid: a case report. Hong Kong J Gynaecol Obstet Midwifery. 2023;23(1). Available from: https://hkjgom.org/home/article/view/328
Hoang VT, Van HA, Trinh CT, et al. Uterine arteriovenous malformation: a pictorial review of diagnosis and management. J Endovasc Ther. 2021;28(5):659-75. doi:10.1177/15266028211018033
Vaduva CC, Dira L, Sandulescu SM, et al. Case report of placenta accreta spectrum and arteriovenous malformations with successful preservation of fertility after birth. Diagnostics. 2024;14(22):2538. doi:10.3390/diagnostics14222538
Hebbar S, Kramadhari H, Sharma R, Bhat R, Shah K. Uterine arteriovenous malformation: a retrospective study from a tertiary center in southern Karnataka. F1000Research. 2025;14:554. doi:10.12688/f1000research.164989.2
Nori W, Zghair MAG, Alrawi S, et al. Fetal extrusion through dehiscence Caesarean scar confirmed by MRI: a case report and review. Clin Womens Health Rep. 2025;22. doi:10.2174/0115734048239188250902045718
Salmeri N, Papale M, Montresor C, Candiani M, Garavaglia E. Uterine arteriovenous malformation (UAVM) as a rare cause of postpartum hemorrhage: a literature review. Arch Gynecol Obstet. 2022;306(6):1873-84. doi:10.1007/s00404-022-06498-0
Vijayakumar A, Srinivas A, Chandrashekar BM, et al. Uterine vascular lesions. Rev Obstet Gynecol. 2013;6(2):69-79. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC3848669/
Habib AH, El-Kaffas KH, Mustafa AS, et al. Role of ultrasound and colored Doppler examination in the diagnosis and classification of superficial soft tissue vascular anomalies. Egypt J Radiol Nucl Med. 2022;53(1):89. doi:10.1186/s43055-022-00763-7
Gruber H, Seifert-Klauss M, Schmaus C. Uterine arteriovenous malformation presenting with amenorrhea: a rare case report and literature review. Reports. 2025;8(3):161. doi:10.3390/reports8030161
Yoon DJ, Jones M, Taani JA, Buhimschi C, Dowell JD. A systematic review of acquired uterine arteriovenous malformations: pathophysiology, diagnosis, and transcatheter treatment. AJP Rep. 2016;6(1):e6-14. doi:10.1055/s-0035-1563721
Yakes WF, Yakes AM. Classification of arteriovenous malformation and therapeutic implication. In: Hemangiomas and Vascular Malformations: An Atlas of Diagnosis and Treatment. Milano: Springer Milan; 2015. p. 263-76. doi:10.1007/978-88-470-5673-2_33
Frey S, Cantieni T, Vuillemin N, et al. Angioarchitecture and hemodynamics of microvascular arterio-venous malformations. PLoS One. 2018;13(9):e0203368. doi:10.1371/journal.pone.0203368
Bohlmann MK, Rath W. Medical prevention and treatment of postpartum hemorrhage: a comparison of different guidelines. Arch Gynecol Obstet. 2014;289(3):555-67. doi:10.1007/s00404-013-3079-2
Cao P, Ji L, Zhang S, Qiao C. Risk factors and prediction model for massive transfusion during cesarean section in singleton pregnancies with anterior placenta previa, prior cesarean and prenatal suspicion of placenta accreta spectrum: a retrospective case-control study. BMC Pregnancy Childbirth. 2025;25(1):910. doi:10.1186/s12884-025-08041-w
