RESUMEN
<p><b>OBJECTIVE</b>To probe the incidence, pathogenesis and clinical characteristics of traumatic subdural hydroma (TSH) developing into chronic subdural hematoma (CSDH).</p><p><b>METHODS</b>We retrospectively analyzed the clinical data of 32 patients with TSH developing into CSDH and reviewed related literature.</p><p><b>RESULTS</b>16.7% of TSH developed into CSDH in this study. The time of evolution was from 22 to 100 days after head injury. All the patients were cured with hematoma drainage.</p><p><b>CONCLUSIONS</b>TSH is one of the origins of CSDH. The clinical characteristics of TSH developing into CSDH follow that the ages of the patients are polarized, that the evolution often happens in the patients with small chronic hydromas and being treated conservatively, that the patients are usually injured deceleratedly and that the accompanying cerebral damage is often very mild.</p>