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，癌巢直径通常小于1.5cm，并且通常被硬化的包围（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.

独特的症状如样瘤的疼痛通常会在夜间加剧，而软瘤、成细胞瘤有时会压迫脊神经，引起麻木和四肢无力。