It is supposed that in many such cases the hemorrhage is due to diapedesis, and not to rupture of a blood-vessel (rhexis).
In these cases hemorrhage by rhexis is altogether more probable even when ruptured vessels cannot be demonstrated.
rhexis rhex·is (rěk'sĭs)
n. pl. rhex·es (rěk'sēz)
Bursting or rupture of an organ or vessel.