That ring of sclerotic tissue often produces prostaglandins, which are small molecules that trigger the sensation of pain.

硬化的骨组织通常会产生前列腺素，这些小分子会引发疼痛感。

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

在骨样骨瘤中，癌巢直径通常小于1.5cm，并且通常被硬化的骨组织包围（边缘硬化）。