| 1. | Go out for advantageous and fetal childbirth , the doctor employs obstetric forceps or fetal head is attracted implement will undertake aiding yield , right now fetal head suffers extruding , make coronal bone overlaps , the head surrounds decrescent , cause the blood - vessel below periosteum likely to get hurt burst , blood builds up slowly a haematoma
为了有利胎儿娩出，医生动用产钳或胎头吸引器来进行助产，此时胎儿头部受挤压，使头颅骨重叠，头围变小，就有可能造成骨膜下血管受伤破裂，血液慢慢积聚成一个血肿。 |
