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BACKGROUND: Chronic subdural haematomas are amongst the most common indications for neurosurgical interventions. Though trauma is the commonest cause of chronic subdural haematomas, there could be influencing factors, which eventually induce this pathology, since  not all trauma to the head are associated with intracranial haematomas.


AIM: The purpose of this study is to look at the possible influence of sex, age, location (side of  the lesion) and environment in the formation of chronic subdural haematomas, using surgery  records for about 4 decades, in Switzerland, Jamaica and Nigeria, and share our experience with others.


SETTING and DESIGN: There were 40 cases of post-traumatic chronic subdural haematomas operated on and followed-up by the author from 1971-2010 in Jamaica, Nigeria and Switzerland. The relevant data were also collected by the author from the hospitals and the author’s personal surgery records.


METHOD :Records of these cases were examined and analysed with particular regards to sex,age, side of the lesion and environment.


STATISTICAL ANALYSIS: Statistical analysis was carried out using the percentage and frequency of occurrence of this lesion.


RESULTS: In the males, there were 6 in Jamaica, 21 in Nigeria and 5 in Switzerland. Eighteen (18) cases were on the right and 14 on the left. The patients’ ages ranged from 21 to 82 years, with a mean 50.15 years. In the females, there were none in Jamaica, 5 in Nigeria and 3 in Switzerland. Five (5) cases                                                                                                                                                         were on the right and 3 cases on the left. The patients’ ages ranged from 35 to 76 years, with a  mean 55.5 years.


CONCLUSION: Based on the data revealed in the results, it could not be concluded that these  parameters played any role in the occurrence of this lesion.

Influencing Factors.
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