骨软骨瘤是一种原发良性骨肿瘤，很少发生在骶骨。

Osteochondroma is a rare primary benign bone tumor that can occur in the sacrum.

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原发肿瘤的骨与软组织的骨盆是罕见的。

Primary tumors of the bone and soft tissue of the pelvis are rare.

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原发肿瘤的骨与软组织的骨盆是罕见的。

Primary tumors of the bone and soft tissue of the pelvis are rare.

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