The authors analyzed 9 cases of chronic subdural hematoma which had been originated from traumatic subdural hygroma patients who were admitted to our department from January. 1990 to June, 1991.
@ES The results of analysis were summarized as follows:
@EN 1) The range was from 23 to 73 years of age, and fifth and sixth decade were two-thirds of all with the sex ratio of male to female 3.5 to 1.
2) The hematoma sites were all the same as those sites of previous subdural hygroma, and all site involved frontal area.
3) It took on average 8 weeks for he hygroma to convert into hematoma.
4) The major clinical symptoms and signs were headache, alteration of consciousness, motor weakness and dysphasia.
5) The densities of hematoma revealed on brain CT at the time of conversion were all hyperdense.
6) Closed drainage through burr holes resulted in an excellent clinical outcome in all cases at the time of discharge, although still remained subdural hygroma in 3 cases on follow-up brain Ct.
7) Patients with traumatic subdural hygroma, even small amount, should be followed for at least 8 weeks and carefully monitored.
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