Figure 3
From: MR imaging features of benign retroperitoneal extra-adrenal paragangliomas
A 60-year-old man with hypertension, positive VMA/24 h and a histologically proven benign retroperitoneal paraganglioma at the right prevertebral region (between the inferior vena cava and aorta). The transverse and longitudinal diameters of the tumor are 2.89 cm and 4.43 cm, respectively. (A) In axial T2WI, the tumor exhibits high signal intensity and isointensity compared with the gluteal muscles. The intratumoral septa exhibit low signal intensity. The tumor capsule is shown in T2WI. (B) In axial DWI, the tumor appears nodular with ring-shaped high signal intensity. (C–E) In T1WI (in-phase, out-phase and pre-scanned imaging, respectively), the partial signal of the tumor is higher than that of the gluteal muscle, and most of the signal of the tumor is of slightly lower intensity than that of gluteal muscle. (F) In contrast T1WI during the arterial phase, the tumor is clearly enhanced with a non-homogeneous ring. The center exhibits no enhancement of the necrotic area and cysts. (G) In coronal T1WI during the delay phase, the tumor exhibits a continuous and non-homogeneous signal increase. The intratumoral septa show a continuous signal increase. (H) ADC imaging; the mean ADC value of the ROI of the tumor is 0.00152 mm2/s.
