Abstract
Uterine rupture is a rare obstetric emergency that is typically associated with the presence of scar tissue such as in the case of previous caesarean section. In this case report, a primigravid patient presented to the hospital in cardiac arrest with massive haemoperitoneum secondary to a posterior uterine rupture. The histological specimen was found to have diffuse adenomyosis at the site of rupture. On review of the literature, there is insufficient evidence to suggest we as clinicians should alter the antenatal care for patients with known adenomyosis; however, this case highlights how we should have a high index of suspicion for those presenting with signs and symptoms of uterine rupture with known adenomyosis in the absence of other risk factors.