In osteoid osteomas, the nidi are smaller than 1.5cm in diameter and are often surrounded by a ring of sclerotic bone tissue.

在样瘤中，癌巢直径小于1.5cm，并被硬化的组织包围（边硬化）。

Some unique symptoms are that the pain of osteoid osteoma typically gets worse at night, while osteochondromas and osteoblastomas sometimes press against spinal nerves, causing numbness and limb weakness.

一些独特的症样瘤的疼痛会在夜间加剧，而软瘤、成细胞瘤有时会压迫脊神经，引起麻木和四肢无力。