Near fatal interstitial pregnancy.

Interstitial pregnancies are a rare form of ectopic pregnancy that occur when there is implantation of a fetus into the interstitial portion of the uterus. These can be particularly challenging to diagnose and have a high risk of morbidity and mortality due to the relatively late presentation compared to other ectopic pregnancies. Here we present a gravida 3, para 2 female patient at 14 weeks gestational age who suffered uterine rupture and hemoperitoneum leading to cardiac arrest in the Emergency Department. This case demonstrates the importance of ultrasound as a critical tool in the diagnosis of interstitial pregnancy and the sonographic findings. It is essential for emergency clinicians to be aware of this rare diagnosis.