=====Petrous ridge=====
{{ ::petrous_ridge.jpg?400|}}
Lesions of the petrous ridge are rare. The wide differential diagnosis includes [[endolymphatic sac tumor]], [[petrous bone meningioma]], jugulotympanic paraganglioma, myeloma, and metastasis. The clinician must take into account unique imaging features on CT and MRI, and final diagnosis often requires pathologic analysis
((Lin GC, Adams ME, Arts HA. Lesions of the petrous ridge: metastatic pituitary 
carcinoma with discussion of differential diagnosis. Otol Neurotol. 2014
Apr;35(4):645-8. doi: 10.1097/MAO.0000000000000326. PubMed PMID: 24622018.))