How long can a chronic subdural lesion be present before being discovered?

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A chronic subdural hematoma can develop over an extended period, often going unnoticed for months to even years before being diagnosed. This delayed presentation is largely due to the slow accumulation of blood that leads to the formation of the hematoma, which may not produce significant symptoms initially. As the body gradually adapts to the presence of the hematoma, symptoms can be vague or mistaken for other conditions, resulting in a long period before the lesion is identified.

In clinical practice, it is not uncommon for healthcare professionals to find chronic subdural hematomas incidentally during imaging studies conducted for unrelated health issues, highlighting how prolonged durations can occur without detection. This underscores the importance of awareness among clinicians regarding the potential for chronic subdural hematomas to manifest subtly over time.