Background: Traumatic acute subdural hematoma (ASDH) is an oft encountered entity in neurosurgery.
While resolution of such thick SDHs usually takes time, certain cases of rapid spontaneous
resolution have also been reported. This article attempts to review the pathophysiology,
clinical and radiological features of such cases, as well as provide an insight into
decision making for their management. Methods: Electronic literature search was done to look for similar cases of spontaneous rapid
resolution of ASDH. Five of authors cases have been described. Their clinical and
radiological features along with those of cases from literature search were tabulated
and analyzed. Results: A total of 44 relevant cases were included for analyses. Of these, 39 cases were
from 33 articles found in existing literature and 5 cases were from author's collection.
The M:F ratio was 25:19 with a mean age was 41.84(SD-4.094) years. Twenty -six patients
showed “Rapid” neurological improvement (</= 24 hours) while “gradual” neurological
improvement (>24 hours) occurred in 10 patients. The mean hematoma resolution time
on CT scan was 13.78 hours (SD 16.46) ranging from 1- 72 hours. Twenty-nine patients
showed redistribution of hematoma, most commonly to tentorium and falx cerebelli.
CT scan findings were classified into 5 types as per the nature of hypodensity around
hematoma. The geometric mean time to resolution of hematoma was least for type 2 (7.27
hours) and type 1(7.52 hours) patients. Conclusion: Selected patients of ASDH with rapid neurological improvement and specific CT findings
may show spontaneous resolution of ASDH. Multicentric studies with larger study population
may provide better insight into the nature and outcomes of such entities.
Key-words:
Acute subdural hematoma - pathophysiology - rapid resolution - traumatic brain injury