Given the task definition and input, reply with output. In this task, you are given a second sentence. Your task is to generate the first sentence on the same topic but incoherent and inconsistent with the second sentence.

However , true metaphyseal chondroblastomas are rare and are typically the result of an extension from a neighboring epiphyseal legion .

Chondroblastomas are usually located in the medullary portion of bones and can , in some cases , include the metaphysis .