Next most common are subependymal nodules, which are hamartomas that form under the ependyma, the thin membrane that lines the ventricles in the brain.

其次是室管膜下结节，即生长在脑室周围那层薄薄的室管膜下的错构瘤。

Individuals are also at an increased risk of developing a subependymal giant cell astrocytoma, or SEGA, which is a type of cancer that can arise from the subependymal nodules.

个体发生室管膜下巨细胞星形细胞瘤（SEGA）的风险也会增加；SEGA是一种可由室管膜下结节引起的癌症。