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Inflammatory myofibroblastic tumor (IMT) of the urinary bladder is a rare soft tissue benign tumor usually presents with hematuria, dysuria or obstructive urinary symptoms. No distant metastasis has been reported except in a single case. There is no clear consensus on the management plan yet. However, complete surgical resection is the mainstay management. We reported a case of a female patient presented with a painless prolapsing urethral mass that bleeds of touch with no signs of local invasion or distant metastasis, complete resection and pathological evaluation of the specimen revealed an IMT. The postoperative period was uneventful for 1 year.

Desmoid tumors (also called deep fibromatoses) are rare benign tumors associated with pregnancy and Gardner syndrome. These tumors are characterized by bland-appearing fibroblasts, indistinct margins, and an ability to cause pathology by local invasion and recurrence. They arise in the abdominal cavity, in the abdominal wall, or in the extremities/trunk, each with a slightly different biologic behavior. Though they are not cancer and do not metastasize, desmoids can cause significant morbidity and occasionally death through local/regional invasion of critical structures. Treatment primarily is surgical, although radiation or systemic therapy can be beneficial to the patient when surgery is not feasible. This article highlights the biology and clinical features of desmoid tumors.

Background Becker nevus is a nevoid melanosis, referred to as Becker nevus syndrome when it is associated with other anomalies. Our objectives were to report the occurrence of a Becker nevus with an underlying desmoid soft-tissue tumor; to review Mayo Clinic's experience with Becker nevi, concentrating on Becker nevi associated with bone, vascular, neural, and other soft-tissue abnormalities; to inform physicians of the Becker nevus syndrome; and finally to alert clinicians to evaluate a Becker nevus with its associations in mind. Observations A 46-year-old woman had a Becker nevus with an underlying desmoid-type fibromatosis (desmoid tumor) presenting clinically as a “painful dimple” within the nevus. Review of medical records for 1997 through 2006 at Mayo Clinic, Rochester, Minnesota, yielded 52 patients with Becker nevi, 12 of whom had an associated bone, vascular, neural, congenital, or other soft-tissue abnormality, ranging from liposarcoma to an accessory areola. Conclusions We add to the literature a unique case of desmoid-type fibromatosis immediately beneath a Becker melanosis, which presented as a painful dimple. We hope to raise awareness that a Becker nevus may be associated with other abnormalities, including an infiltrative soft-tissue tumor. We also emphasize the importance of follow-up, including inspection of not only the surface but also the deep tissues underlying the Becker nevus.