Haemoperitoneum may occur for a multitude of reasons, with CT imaging ( multiphase with high contrast flow rates ) being the typical initial investigation of choice.
It is important to try and establish:
1. The source of the bleeding
2. The status of the bleeding - is it active at the time of scanning?
This is identified by observing the presence of active contrast extravasation ( ' the squirter' as our surgical colleagues would say ).
This patient proceeded to theatre with haemorrhage occurring from a ruptured corpus luteum cyst.