菱形窝在正中线上有一正中沟(median sulcus)，沟外侧有内侧隆起(medial eminence)，其 外侧有与正中沟大致平行的界沟(sulcus limitans)。
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沿后正中沟切开颈髓，肿瘤位于髓内，沿肿瘤边界分离并全切除。
Cervical incision was performed in posterior midline ditch, and the tumor could be seen intramedullary, which was separated along the boundary and totally removed finally.
左大脑半球肿胀通过小脑幕形成海马钩回疝和正中线偏移，从而出现此处白色箭头所示的沟。
Swelling of the left cerebral hemisphere has produced a shift with herniation of the uncus of the hippocampus through the tentorium, leading to the groove seen at the white arrow.
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