Which of the following procedures may require a postauricular incision?

A postauricular incision is specifically utilized in mastoidectomy procedures. This type of incision is made behind the ear and allows for direct access to the mastoid process and the middle ear, facilitating surgical intervention. Mastoidectomy involves the removal of mastoid air cells, which may be necessary due to chronic infections or other pathological conditions affecting the mastoid bone. The postauricular approach is advantageous as it provides a clear view of the operative field while minimizing trauma to surrounding structures.

In contrast, myringotomy and tympanostomy are procedures targeting the tympanic membrane and typically do not necessitate a postauricular incision; they can be performed through the ear canal. Adenoidectomy, which involves the removal of the adenoids located at the back of the nasal cavity, also does not require this incision, as access is obtained via the oral cavity. Thus, when considering the specific requirements for incisions in these procedures, the mastoidectomy clearly necessitates a postauricular incision.