HRCT of the temporal bone would also show some other conditions that cause PT but do not present as a vascular retrotympanic lesion. These conditions include high-riding jugular bulb, jugular bulb diverticulum, SSWA, SSCD, and Paget disease. Tinnitus Arteriography Cervicocerebral There is no relevant literature to support the use of cervicocerebral arteriography for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. CT Head With IV Contrast There is no relevant literature to support the use of CT head with IV contrast for evaluation of PT. CT Head Without and With IV Contrast There is no relevant literature to support the use of CT head without and with IV contrast for evaluation of PT. CT Head Without IV Contrast There is no relevant literature to support the use of CT head without IV contrast for evaluation of PT. CT Temporal Bone With IV Contrast There is no relevant literature to support the use of CT temporal bone with IV contrast for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. CT temporal bone without contrast is adequate as described in the next section, and IV contrast does not offer any significant benefits in those indications. Changes in contour of air and bone in the temporal bone study are the key features in making the diagnosis. CT Temporal Bone Without and With IV Contrast There is no relevant literature to support the use of CT temporal bone without and with IV contrast for evaluation of PT. CT Temporal Bone Without IV Contrast CT temporal bone without IV contrast is useful as a first-line imaging modality when a vascular retrotympanic lesion is seen on otoscopic examination. Retrotympanic lesion may be because of a retrotympanic mass such as a glomus tumor (paraganglioma), or vascular variants. It is imperative to distinguish between the two to avoid unnecessary biopsies, which can have devastating complications.
Tinnitus. HRCT of the temporal bone would also show some other conditions that cause PT but do not present as a vascular retrotympanic lesion. These conditions include high-riding jugular bulb, jugular bulb diverticulum, SSWA, SSCD, and Paget disease. Tinnitus Arteriography Cervicocerebral There is no relevant literature to support the use of cervicocerebral arteriography for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. CT Head With IV Contrast There is no relevant literature to support the use of CT head with IV contrast for evaluation of PT. CT Head Without and With IV Contrast There is no relevant literature to support the use of CT head without and with IV contrast for evaluation of PT. CT Head Without IV Contrast There is no relevant literature to support the use of CT head without IV contrast for evaluation of PT. CT Temporal Bone With IV Contrast There is no relevant literature to support the use of CT temporal bone with IV contrast for evaluation of PT when otoscopy shows a vascular retrotympanic lesion. CT temporal bone without contrast is adequate as described in the next section, and IV contrast does not offer any significant benefits in those indications. Changes in contour of air and bone in the temporal bone study are the key features in making the diagnosis. CT Temporal Bone Without and With IV Contrast There is no relevant literature to support the use of CT temporal bone without and with IV contrast for evaluation of PT. CT Temporal Bone Without IV Contrast CT temporal bone without IV contrast is useful as a first-line imaging modality when a vascular retrotympanic lesion is seen on otoscopic examination. Retrotympanic lesion may be because of a retrotympanic mass such as a glomus tumor (paraganglioma), or vascular variants. It is imperative to distinguish between the two to avoid unnecessary biopsies, which can have devastating complications.