BACKGROUND Intracranial interdural cyst is a rare lesion. The exact pathophysiology of these cysts remains unknown. CLINICAL PRESENTATION We report an infant with interdural cyst of the tentorium cerebelli. Although the cyst mimicked an arachnoid cyst on pre- and postnatal magnetic resonance images, lateral suboccipital craniotomy revealed the cyst within the tentorium. Fenestration on the infratentorial side was performed with successful results. Histologically, the inner surface of the cyst was lined with arachnoid cells. CONCLUSION We report detailed neuroradiological, intraoperative, and histological findings, and discuss the pathophysiology of the cyst in this case.

中文翻译：

---

小脑腱膜先天性硬脑膜蛛网膜囊肿。

背景技术颅内硬膜囊肿是一种罕见的病变。这些囊肿的确切病理生理机制仍然未知。临床表现我们报告了一名小脑腱鞘硬膜囊肿婴儿。尽管囊肿在出生前和产后的磁共振图像上都模仿了蛛网膜囊肿，但枕下侧开颅手术却发现了腱鞘内的囊肿。在腹侧进行开窗术，取得了成功的结果。组织学上，囊肿的内表面衬有蛛网膜细胞。结论我们报告了详细的神经放射学，术中和组织学发现，并讨论了这种情况下囊肿的病理生理学。