This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - II, Subject name: Gynaecology & Obstetrics
Which of the following is TRUE about cephalhematoma 
Select and explain. 
A. It is caused by oedema of the subcutaneous layer of the scalp, B. Treatment is by aspiration, C. Tension does not vary with crying, D. Most common over the occipital pa of the skull
C: Tension does not vary with crying
Answer: C: Tension does not vary with crying 
Explanation: Cephalohematoma cranial subperiosteal hematomas cause is prolonged second stage of labour or instrumental delivery develop from shearing forces during labor and delivery that lacerate the emissary or diploic veins, the densely adhered periosteum impedes rapid enlargement and limits final hematoma size. does not cross suture line may not be apparent until hours after delivery untill bleeding sufficient to raise the periosteum has occurred. no treatment required unless hyperbilirubinemia is present Caput succedaneum swelling of the scalp causes edema that overlies the periosteum. maximal at bih cause is pressure of presenting pa against cervix crosses suture line rapidly grows smaller, and usually disappears within hours or a few days no treatment required