Fig. 2.

Sagittal (A) and axial (B) T2-weighted fat-suppressed MR images show a large, heterogeneous, predominantly hyperintense pelvic plexiform neurofibroma (arrows) displacing the bladder (asterisk) anteriorly and superiorly. The bladder is encircled by the lesion. A portion of the lesion is also seen posterior to the rectum (curved arrow). Figure 2C: Axial T2-weighted fat suppressed MR image at a lower level than B shows a portion of the plexiform neurofibroma (arrow), which is anterior to the urethra (arrowhead in C). In addition, the lesion also extends along the right spermatic cord (dash arrow in C). Plexiform neurofibroma is also seen posterior to the rectum (curved arrow). The mass shows multiple rounded areas of central low and peripheral high signal intensity. This finding is referred to as the “target sign” and is highly suggestive of plexiform neurofibroma.