在不同的发育阶段,头颅的许多骨块是由颅缝、软骨联合和颅裂联接起来的。由于血管沟、板障血管、骨管和骨孔的存在,产生密度减低的阴影。初学者可将这些正常结构误认为骨折,即使很有经验的人,也因众多的先天变异而感到棘手。在头部外伤后也常出现人为的伪影。 At various stages of development, many of the cranium’s bones are connected by cranial sutures, cartilage joints, and cranial fissures. Due to the presence of vascular ditch, barbed vessel, bone canal and bone hole, a shadow of reduced density results. Beginners can mistakenly recognize these normal structures as fractures, and even experienced people find it difficult because of numerous innate variations. Artificial artifacts often appear after head trauma.