Chronic subdural haematoma refers to collection present for a period of –
**Core Concept**
Chronic subdural hematoma (CSDH) is a type of intracranial hemorrhage characterized by the accumulation of blood between the dura mater and the arachnoid membrane, lasting for an extended period. The pathophysiology involves the slow accumulation of blood, which can lead to mass effect and increased intracranial pressure.
**Why the Correct Answer is Right**
CSDH typically occurs in the setting of minor head trauma in the elderly or those with underlying coagulopathy. The slow accumulation of blood is due to the gradual separation of the bridging veins from the dural sinuses, resulting in a collection of blood that can persist for weeks or even months. The correct answer refers to the duration of the hematoma, which is essential for differentiating CSDH from acute subdural hematoma.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the duration of CSDH. The exact timeframe can vary, but it is generally considered to be longer than what is specified here.
**Option B:** This option is incorrect because it does not account for the gradual accumulation of blood in CSDH. The collection of blood is a slow process, which distinguishes CSDH from acute subdural hematoma.
**Option C:** This option is incorrect because it does not accurately reflect the duration of CSDH. The correct duration is typically longer than what is specified here.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that CSDH can occur in the absence of significant trauma, especially in the elderly population. This highlights the importance of a high index of suspicion and prompt imaging in patients with symptoms of increased intracranial pressure.
**Correct Answer:** C.