Frequency, types and causes of intraventricular haemorrhage in lethal blunt head injuries

Autopsy findings and neuropathological examination of formalin-fixed brains in 676 deaths due to blunt head injury, here with special attention to injuries of the inner (periventricular) cerebral structures and haemorrhages into the ventricles.Intraventricular haemorrhage of any degree was present in 17.6%, considering only distinct and massive haemorrhage in 10% of all cases. Considering the types of trauma, the frequency was lowest in ground level falls and highest in traffic accidents (pedestrians with head contact to the car) – indicating a relation between the severity of impacts and the likelihood of ventricular haemorrhage. They predominantly resulted from periventricular injuries (27%) or retrograde expansions of infratentorial lesion with subarachnoid bleeding (19%), from massive contrecoup lesions (14%) or deep intracerebral ruptures (13%). In cases with predominant lesions of the cerebral surface the rate was lower than in those with more diffuse or internal damages.Injuries of the internal cerebral regions (away from cortex and subcortical white matter) were classified into those directly affecting the periventricular structures (9.1–13.5%; half of them affecting corpus callosum and/or fornix) and lesions of deep white matter or basal ganglia not adjoining the ventricular walls (4.0–5.9%). Intraventricular haemorrhage as well as injuries of the inner cerebral structures mostly are one element of a complex and severe blunt head injury. Solitary lesions – without other intracranial findings clearly indicating a trauma and therefore cases producing difficulties in forensic classification (spontaneous? traumatic?) – are rarities according to literature as well as our experiences.