Figure 4
From: MR imaging features of benign retroperitoneal extra-adrenal paragangliomas
A 53-year-old woman with dizziness and hypertension and a histologically proven benign retroperitoneal paraganglioma at the left paravertebral region (adjacent to the left adrenal gland). The transverse and longitudinal diameters of the tumor are 8.04 cm and 9.71 cm, respectively. (A) In axial T2WI, the tumor exhibits mixed signal intensity, including high signal intensity, slightly high signal intensity, and isointensity, compared with the gluteal muscles. The signs of fluid-fluid levels can be seen. The intratumoral septa exhibit low signal intensity. (B) In axial DWI, the tumor appears with a ring of high signal intensity. (C–E) In T1WI (in-phase, out-phase and pre-scanned imaging, respectively), the signal of the tumor is slightly lower than that of the gluteal muscle in in-phase imaging and pre-scanned imaging, and exhibits a linear and sheet-like high signal in out-phase imaging. (F) In contrast T1WI during the arterial phase, the tumor exhibits slight and non-homogeneous enhancement. The center exhibits no enhancement of the necrotic area. (G) In coronal T1WI during the delay phase, the tumor is slightly enhanced. (H) ADC imaging; the mean ADC value of the ROI of the tumor is 0.00130 mm2/s.
