Trismus in CA of temporal bone occurs due to involvement of ?

Clinical Assessment of Temporal bone Tumors A long history of ear discharge suggests cancer associated with inflammatory ear disease (Marjolins ulcer) Pulsatile tinnitus suggests tumor of vascular origin such as glomus tumor or a middle ear vascular anamoly, or a duralaeriovenous abnormality. Deep headache raises the suspicion of dural involvement. Facial weakness indicates invasion of the facial nerve Onset of veigo and sensineuronal hearing loss indicates involvement of the labyrinth and the development of speech and swallowing problems heralds involvement of the lower cranial nerves in the jugular foramen. The onset of trismus due to the involvement of temporomandibular joint, pterygoid muscles or mandible suggests advanced disease that has spread anteriorly. Also the appearance of preauricular and parotid swelling is a grave sign.