Elsevier

Oral Oncology

Volume 37, Issue 8, December 2001, Pages 673-675
Oral Oncology

Case report
Benign fibrous histiocytoma (BHF) of the cheek: CD 68-KP1 positivity

https://doi.org/10.1016/S1368-8375(01)00006-9Get rights and content

Abstract

We present a case of fibrous histiocytoma of the cheek in a 32-year-old male with no evidence of any regional invasion or distant metastasis. Pathologic analysis and diagnosis of these lesions is often challenging, and usually based on a combination of light microscopy and immunohistochemistry. In this study the diagnosis was confirmed using immunostaining with the antibody CD 68-KP1 that is positive in any lesion containing lysosomal granules or phagolysosomes.

Introduction

Benign fibrous histiocytoma (BFH) has been described as a benign neoplasm of fibroblasts and histiocytes that affects the soft tissues of the dermis and subcutaneous layers [1]. These neoplasms should be differentiated from the malignant fibrous histiocytoma (MFH), which frequently has an aggressive malignant course [2]. MFH occurs in soft tissues and also bone, usually around the knee, and less frequently in the lower or upper extremities and pelvis [3] and in the face.

BFH was not known as a clinical entity before 1970 when, as a result of the development of immuno-histochemical techniques and electronic microscopy, differential diagnosis became feasible [4]. BFH is seen mainly in adults and most frequently in young and middle aged women. BFH occurs most commonly in the soft tissues in the lower extremities (50%), less frequently in the upper extremities (20%), retroperitoneum (20%) and orbit . Reports of BFH in the facial tissues are rare [5]. We report a rare case of benign fibrous histiocytoma of the cheek in a young patient and show the confirmation of diagnosis by novel immunostaining.

Section snippets

Patients and methods

A 32-year-old male presented in September 1999 with an obvious painless swelling in the right cheek. He had been aware of this for approximately 2 years and it had slowly enlarged. He had no other similar swellings and his medical history was non-contributory. Examination revealed a non-tender elastic-hard lump of approximately 6–7 cm in diameter with a smooth surface, defined periphery and some mobility. The mucosal surface appeared normal. Surgical excision revealed a smooth encapsulated

Discussion

Fibrous histiocytoma exists as a benign or a malignant neoplasm. The terminology used in the literature to identify this group of lesions is unclear, due to difficulties in differential diagnosis between malignant and benign forms. However, the diagnosis of benign histiocytoma should not rely entirely on histological findings, since there are reports of fibrous histiocytomas with benign characteristics that later developed metastases [4], [5].

The most widely used classification for histiocytic

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