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Fig. 6D —MRI of 74-year-old woman with history of urethral collagen
injection 4 years previously for urinary incontinence. Physical examination
revealed small, firm urethral mass, and MRI was requested to exclude urethral
neoplasm. Gadolinium-enhanced axial VIBE image clearly shows bilateral,
nonenhancing pockets of collagen flanking urethral mucosa (arrow).
Note signal intensity of unenhanced images excludes possibility of urethral
diverticulum, which also would fail to enhance.
