Clinical bottom line
Uterine artery pseudoaneurysm (UAP) is a rare but potentially life-threatening cause of delayed postpartum or post-procedural hemorrhage. Advances in imaging and minimally invasive interventions, particularly uterine artery embolization (UAE), have improved diagnosis and management, enabling effective hemorrhage control while preserving fertility. Prompt recognition and treatment of UAP can prevent catastrophic bleeding and avoid more invasive surgical procedures. However, awareness remains limited, and diagnosis may be delayed due to nonspecific clinical presentations.
What the evidence shows
UAP typically arises from iatrogenic injury to the uterine artery during gynecologic procedures such as cesarean section, myomectomy, or uterine manipulation (Seki et al., 2017; Takeda et al., 2008). It may present days to weeks after the inciting event with sudden, massive vaginal bleeding. Imaging modalities including color Doppler ultrasonography and contrast-enhanced CT or MRI are critical for diagnosis, revealing characteristic “yin-yang” flow patterns and pseudoaneurysm sacs.
Minimally invasive management with uterine artery embolization has emerged as the preferred treatment modality. UAE achieves hemostasis by selectively occluding the feeding artery, preserving uterine tissue and fertility potential (Takeda et al., 2008; Chahine et al., 2013). Embolization materials vary, but coils and particles are commonly used. Case series and reports demonstrate high success rates with low complication profiles, even in emergent settings.
Surgical options, including laparoscopic or open arterial ligation, are reserved for cases refractory to embolization or when embolization is unavailable (Sawada et al., 2021). Laparoscopic approaches to hemostasis and pseudoaneurysm repair have been described, offering minimally invasive alternatives with favorable outcomes (Sawada et al., 2021). However, these require surgical expertise and may carry higher morbidity compared to embolization.
Early recognition is essential, as delayed diagnosis can lead to life-threatening hemorrhage. Clinical suspicion should be high in patients with delayed postpartum bleeding or hemorrhage after gynecologic surgery. Imaging should be promptly obtained to confirm diagnosis and guide therapy.
Caveats and uncertainty
The evidence base for UAP management is primarily composed of case reports and small case series, limiting generalizability. No randomized controlled trials exist comparing embolization with surgical or conservative management. The optimal embolic agent and long-term fertility outcomes post-embolization remain incompletely characterized.
Diagnosis can be challenging due to the rarity of UAP and overlap with other causes of postpartum hemorrhage. False negatives on imaging may occur if the pseudoaneurysm is thrombosed or small. Additionally, access to interventional radiology services may be limited in some settings, delaying treatment.
The risk of recurrence after embolization is low but not zero, necessitating follow-up imaging in some cases. Potential complications of embolization include uterine ischemia, infection, and non-target embolization, although these are uncommon.
How this may change practice
Increased awareness of UAP as a cause of delayed postpartum or post-surgical hemorrhage can prompt earlier diagnosis and intervention, reducing morbidity. Obstetricians and gynecologists should consider UAP in differential diagnoses when encountering unexplained vaginal bleeding after uterine procedures.
Integration of color Doppler ultrasonography into postpartum hemorrhage workup can facilitate rapid bedside diagnosis. Establishing protocols for timely referral to interventional radiology for uterine artery embolization can improve outcomes and preserve fertility.
Training in laparoscopic hemostatic techniques may provide valuable alternatives when embolization is contraindicated or unavailable. Multidisciplinary collaboration among obstetricians, radiologists, and surgeons is essential for optimal management.
Future research should focus on standardized diagnostic criteria, comparative effectiveness of embolic agents, and long-term reproductive outcomes to refine management guidelines.