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Exploration confirmed that the mass extended from the aditus ad antrum to the external auditory canal and involved the incudomalleolar joint; the mobility of the joint was extremely limited.
A soft, grayish, well-demarcated mass filled the mastoid antrum, mastoid tip, aditus ad antrum, and epitympanum.
Therefore, the drug likely distributes, except in rare exceptions such as a blocked aditus ad antrum.