Phelps sign is seen in :
Ans. is 'a' ie Glomus jugulare " The absence of the normal crest of bone between the carotid canal and jugular fossa on lateral tomography is virtually diagnostic of a glomus jugulare tumor. This is k/a Phelps' sign." - Scott-Brown, 5/e
Glomus jugulare
Vestibular shwanoma
Menniers disease
Neurofibromatosis
Tumors