Background: Determining a subdural hematoma (SDH) to be chronic by definition takes 3 wk, whereas organized chronic SDH (OCSDH) is an unusual condition that is believed to form over a much longer period of time, which generally demands large craniotomy. Therefore, it is a lengthy process from the initial head trauma, if any, to the formation of an OCSDH. Acute SDH (ASDH) with organization-like, membranaceous appearances has never been reported.
Case summary: A 56-year-old woman presented to our hospital with a seizure, and computed tomography (CT) on admission was negative for signs of intracranial hemorrhage. She had clear consciousness and unimpaired motor functions on arrival and remained stable for the following week, during which she underwent necessary examinations. On the morning of day 10 of hospitalization, she accidentally hit her head hard against the wall in the bathroom and promptly lapsed into complete coma within 2 h. Therefore, we performed emergency CT and identified a left supratentorial SDH that was an absolute indication for surgery. However, the intraoperative findings were surprising, with no liquefaction observed. Instead, a solid hematoma covered with a thick membrane was noted that strongly resembled an organized hematoma. Evacuation was successful, but the family stopped treatment the next day due to financial problems, and the patient soon died.
Conclusion: Neurosurgeons should address SDHs, especially ASDHs, with discretion and individualization due to their highly diversified features.
Keywords: Acute subdural hematoma; Case report; Craniotomy; Encapsulation; Organized chronic subdural hematoma; Subacute subdural hematoma.
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