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J Med Case Rep. 2011 Nov 10;5:549. doi: 10.1186/1752-1947-5-549.

Malignant fibrous histiocytoma of the urinary bladder as a post-radiation secondary cancer: a case report.

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1
Department of Pathology, Phramongkutklao College of Medicine, 315 Ratchawithi Road, Thung Phayathai, Ratchathewi, Bangkok 10400, Thailand. thirayost@gmail.com.

Abstract

INTRODUCTION:

Malignant fibrous histiocytomas have been periodically reported as the primary tumor in various organs including the urinary bladder, and is the second most frequent sarcoma of the urinary tract in adults. This report discusses a case of the well established diagnosis of a malignant fibrous histiocytoma of the bladder occurring as a post-radiation cancer after the treatment of a cervical carcinoma. Our findings support those of many previous studies and make the view of the nature of the disease clearer.

CASE PRESENTATION:

We report the case of a 54-year-old Thai woman who had been treated with radiation therapy for cervical cancer, who presented to our facility with urinary incontinence. Initially, our patient was diagnosed as having a high-grade urothelial carcinoma. Subsequent radical surgery rendered the final pathological diagnosis, confirmed histologically and immunohistochemically as malignant fibrous histiocytoma, with clinical and pathological staging of T4b N0 M0. Adjuvant chemotherapy was provided for our patient.

CONCLUSIONS:

This type of malignancy is very aggressive and easily misdiagnosed due to its rarity. Therefore, in a patient with a prior history of irradiation in the pelvic area, this should be considered as a differential diagnosis to ensure early correct diagnosis and treatment.

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