Secondary postpartum hemorrhage due to uterine scar dehiscence, a case report

Secondary postpartum hemorrhage is rare. The most common cause is retained placenta. Having a uterine scar dehiscence as an etiology is unusual. Complete dehiscence of the uterine scar is even rarer. This rare but serious cause of post-partum haemorrhage can be potentially life threatening due to severe hemorrhage if not managed in adequate time.

We present the case of a 35-year-old patient, gravida 2 para 2. She had undergone two caesarean sections in our department and, after the last one in March 2021, she presented twice to our emergency department with relatively abundant metrorrhagia, but neither the clinical nor the radiological examinations revealed any abnormalities. At 43 days postpartum, she presented to the emergency with severe bleeding per vaginum. The bleeding was profuse, causing hemodynamic instability and severe acute anaemia. An explorative laparotomy was necessary to diagnose the etiology and manage the treatment. Surgical exploration revealed a lateral uterine rupture in the broad ligament and complete dislocation of the caesarean scar. An urgent hysterectomy was performed.

Partial or complete dehiscence of the hysterorrhoea is a rare cause of secondary postpartum hemorrhage after caesarean section. When hysterorrhaphy dehiscence does occur, the origin of the bleeding is likely to be related to erosion of the vessels at the incision angles.

The diagnosis of partial or complete dehiscence of the uterine scar may be misleading in the absence of specific clinical or radiological signs. This condition must therefore be considered and suspected in cases of secondary postpartum hemorrhage.