Sporadic Retroperitoneal Fibrosis: a Gentle Giant

Abstract

Fibromatosis covers a broad spectrum of benign fibrous tissue proliferation and is characterized by slow growing, locally infiltrative growth pattern with a high propensity for local recurrence. We report on a case of multicentric fibromatosis originating from the retroperitoneal space and submandibular triangle, in an 18-year-old lady. Computed tomography revealed a retroperitoneal abdominopelvic tumor extending from the left sub-diaphragmatic space to the pelvic inlet which had enveloped the solid viscera in the left upper quadrant with a displaced celiac axis. She also had a recurrent resectable fibromatosis in left submandibular gland. Histopathological evaluation revealed fibromatosis. Preoperatively, Vinblastin-, Methotrexate-, Tamoxifen-based systemic chemotherapy was offered for 12 weeks in an attempt to downsize the mass. An en bloc complete resection of tumor with multi-visceral resection was performed to achieve negative margins and since then, the patient has remained asymptomatic without any signs of tumor recurrence during the 12th month follow-up visit. Complete resection with negative margins is the treatment of choice and majority of the lesions are amenable for surgical resections. Adjuvant therapy using non-steroidal anti-inflammatory agents, tamoxifen, interferon, anti-neoplastic agents, and radiotherapy, either alone or in combination finds application for un-resectable or recurrent cases.

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