Fig. 4

Images of a 43-year-old woman with carotid body paraganglioma. a Axial T2-weighted MR image showing a hypointense mass in the right carotid space (asterisk); b Selected series of subtracted source images on non-CE 4DMRA. Chronological signal increase corresponding to the tumor is indicated by arrows. High signals corresponding to soft tissue are indicated by arrowheads. c Selected series of anteroposterior MIP images on non-CE 4DMRA. The arterial feeders (arrow) derived from the right ECA and enlarged rt. ascending pharyngeal artery (curved arrow) are shown. High signals corresponding to soft tissue are noted (arrowheads). d Selected series of anteroposterior MIP images on CE 4DMRA. Arterial tumor feeders are derived from the right ECA (arrow) and enlarged right ascending pharyngeal artery (curved arrow). Tumor stain (asterisk) is seen in the early arterial phase. TT Trigger time, ECA external carotid artery, CE 4DMRA contrast enhanced four-dimensional magnetic resonance angiography, non-CE 4DMRA non-contrast enhanced 4DMRA