Which is not true about cephalohaematoma?
**Core Concept**
Cephalohaematoma is a condition characterized by the collection of blood between the periosteum and the skull bones, typically occurring in newborns due to birth trauma. This condition involves the separation of the periosteum from the underlying bone, leading to blood accumulation. The periosteum is a layer of connective tissue that covers the surface of bones.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of cephalohaematoma. Cephalohaematoma is a distinct entity from subdural hemorrhage, as it occurs between the periosteum and the bone, whereas subdural hemorrhage occurs between the dura mater and the arachnoid mater. The periosteum plays a crucial role in the development of cephalohaematoma, as it separates from the underlying bone due to trauma, allowing blood to accumulate.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as cephalohaematoma does indeed occur in newborns due to birth trauma, such as during delivery.
* **Option B:** This option is incorrect as cephalohaematoma is a collection of blood between the periosteum and the skull bones, not a collection of blood within the skull.
* **Option D:** This option is incorrect as cephalohaematoma typically resolves on its own within 2-6 weeks, without the need for surgical intervention.
**Clinical Pearl / High-Yield Fact**
Cephalohaematoma is often mistaken for subdural hemorrhage, but the key difference lies in the location of the blood collection. Remember the mnemonic "SDH" for subdural hemorrhage, and "CH" for cephalohaematoma to differentiate between the two conditions.
**Correct Answer:** B.