为扁骨的两层骨密质之间的一层骨松质。板障中有迂曲的板障管，供血管穿行。
正常的板障间隙被纤维结缔组织所替代，并伴有众多的血管沟。
The normal diploic space is replaced by fibrous connective tissue with numerous large vascular channels.
结果：病灶侵及鼓膜、鼓岬、砧锤骨、镫骨及周围，均呈板障型乳突，无并发胆脂瘤。
Results: The lesion intruded into drum, promontory of tympanum, incudomalleus, stapes and its surroundings, and no cholesteatoma accompanied by.
结论：枕骨板障静脉池的CT表现较具特征，掌握其影像特点并结合临床有助于鉴别诊断。
Conclusion:CT can clearly demonstrate the occipital diploic vein pool, which helps for the diagnosis of this disease.
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