Large abdominopelvic mammary-type myofibroblastoma with incomplete resection and recurrence

A 48-year-old man consulted for vague abdominal discomfort and increased urinary frequency. CT showed a large abdominopelvic mass compressing the urinary bladder, prostate, and rectum (Fig. 1). This lesion was well-demarcated with no involvement of adjacent anatomic structures. Surgery and pathology showed a mammary-type myofibroblastoma (MTM), which was incompletely resected due to its large size. Follow-up CT, a year later, showed a recurring lesion in the pelvis with very slow growth during subsequent 4-year imaging monitoring (Fig.

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