osteoma

1.Single cancellous osteomas, unlike exostosis, are a relatively rare lesion in the external auditory canal.

单性疏松瘤，不像外生疣，是个外耳道较少见的病。

2.An osteoblastoma is just a big osteoid osteoma in the vertebra.

细胞瘤恰是椎上的大样瘤。