First sign of raised intracranial pressure in fundoscopy is
**Core Concept**
The first sign of raised intracranial pressure (ICP) in fundoscopy is related to the changes in the optic disc and its associated blood vessels. The optic disc is the point on the retina where the optic nerve fibers exit the eye, and it is sensitive to changes in ICP.
**Why the Correct Answer is Right**
The correct answer is related to the **papilledema**, which is the swelling of the optic disc due to increased ICP. This occurs when the pressure in the cranial vault exceeds the pressure in the optic nerve sheath, leading to fluid accumulation in the optic disc. The papilledema is a result of the compression of the retinal veins and the displacement of the optic nerve fibers. The initial sign of papilledema is the **blurring of the optic disc margins**, which is a subtle but critical change that can be detected during fundoscopy.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the first sign of raised ICP in fundoscopy. While the optic disc may become swollen in severe cases of papilledema, the first sign is the blurring of the optic disc margins.
* **Option B:** This option is incorrect because it is not a specific sign of raised ICP in fundoscopy. The presence of retinal hemorrhages or exudates may indicate a range of conditions, including hypertensive retinopathy or diabetic retinopathy, but they are not the first sign of raised ICP.
* **Option C:** This option is incorrect because it is not a specific sign of raised ICP in fundoscopy. The presence of choroidal folds or retinal detachment may indicate severe raised ICP, but they are not the first sign.
**Clinical Pearl / High-Yield Fact**
The blurring of the optic disc margins is a subtle but critical sign of raised ICP, and it is often the first sign that can be detected during fundoscopy. Remember the phrase " **P** apilledema is the first sign of **I** ncreased **C** ranial **P** ressure" to associate this critical sign with the underlying condition.
**Correct Answer: C. Blurring of the optic disc margins**