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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Semin Nucl Med. 2013 Nov;43(6):462–473. doi: 10.1053/j.semnuclmed.2013.06.005

Figure 4. Residual tympanic PGL after surgery.

Figure 4

Axial SE T1-weighted (A), early arterial contrast-enhanced T1-weighted (B), early venous contrast-enhanced T1-weighted (C) and T2- weighted (D), CT scan with a bone algorithm (E), time-intensity curve on dynamic contrast-enhanced MRI (F), axial 18F-FDOPA PET (G), axial 18F-FDOPA PET/CT fusion image (H), coronal 18F-FDOPA PET/CT fusion image (I).

Previous canal wall up tympanomastoidectomy (A-E, asterisk). Residual tympanic PGL (A-E, red arrowheads) located in the petrous apex, posteriorly to the carotid artery (white arrowheads) and lateral to the cochlear aqueduct (arrows). The time-intensity curve shows arterial enhancement of the PGL and enables precise delineation of the lesion prior to sigmoid sinus and nasopharyngeal mucosa enhancements. 18F-FDOPA PET was positive (red arrowheads).