CT temporal bone without contrast can show masses like glomus tympanicum, otic capsule lesions such as otosclerosis, or vascular variants like aberrant or lateralized internal carotid artery (ICA), PSA, and dehiscent jugular foramen [1,36]. HRCT of the temporal bone can also detect some other conditions that cause PT but do not always present as a vascular retrotympanic mass, such as otospongiosis, Paget disease, sigmoid sinus diverticulum and sigmoid sinus dehiscence, high-riding jugular bulb, and SSCD [39]. Tinnitus Although CTA can detect a lot of the pathologies that can be the cause of PT when there is a retrotympanic vascular lesion, CT of temporal bone can accomplish the same, and perhaps better, because of a smaller field-of-view and higher resolution, and therefore that is preferred over the CTA. CTV Head With IV Contrast Thin-section bone reconstructions from the source images of the CTV provide enough resolution and details to detect bony abnormalities, vascular variants, and glomus tympanicum, which present as vascular retrotympanic lesions. Contrast is not necessary to make diagnosis of aberrant ICA, PSA, high-riding jugular bulb, dehiscent jugular foramen, or glomus tympanicum, because changes in bony and air contour in the temporal bone are sufficient to make a diagnosis. Although CTV can be used for a lot of the pathologies that can be the cause of PT when there is a retrotympanic vascular lesion, CT of temporal bone can accomplish the same, and perhaps better, because of a smaller field-of-view and higher resolution, and therefore that is preferred over the CTV. MRA Head With IV Contrast There is no relevant literature to support the use of MRA head with IV contrast for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. Aberrant ICA can be diagnosed by MRA head with IV contrast.
Tinnitus. CT temporal bone without contrast can show masses like glomus tympanicum, otic capsule lesions such as otosclerosis, or vascular variants like aberrant or lateralized internal carotid artery (ICA), PSA, and dehiscent jugular foramen [1,36]. HRCT of the temporal bone can also detect some other conditions that cause PT but do not always present as a vascular retrotympanic mass, such as otospongiosis, Paget disease, sigmoid sinus diverticulum and sigmoid sinus dehiscence, high-riding jugular bulb, and SSCD [39]. Tinnitus Although CTA can detect a lot of the pathologies that can be the cause of PT when there is a retrotympanic vascular lesion, CT of temporal bone can accomplish the same, and perhaps better, because of a smaller field-of-view and higher resolution, and therefore that is preferred over the CTA. CTV Head With IV Contrast Thin-section bone reconstructions from the source images of the CTV provide enough resolution and details to detect bony abnormalities, vascular variants, and glomus tympanicum, which present as vascular retrotympanic lesions. Contrast is not necessary to make diagnosis of aberrant ICA, PSA, high-riding jugular bulb, dehiscent jugular foramen, or glomus tympanicum, because changes in bony and air contour in the temporal bone are sufficient to make a diagnosis. Although CTV can be used for a lot of the pathologies that can be the cause of PT when there is a retrotympanic vascular lesion, CT of temporal bone can accomplish the same, and perhaps better, because of a smaller field-of-view and higher resolution, and therefore that is preferred over the CTV. MRA Head With IV Contrast There is no relevant literature to support the use of MRA head with IV contrast for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. Aberrant ICA can be diagnosed by MRA head with IV contrast.