Case reportBenign fibrous histiocytoma (BHF) of the cheek: CD 68-KP1 positivity
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.
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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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2017, Medical Journal Armed Forces IndiaBenign fibrous histiocytoma of the ethmoids in an infant
2015, Medical Journal Armed Forces IndiaCitation Excerpt :Immunohistochemical staining and ultrastructural examination of the tumors and cell lines derived from them has revealed features of myoblastic and histiocytic differentiation as evidence of mesenchymal origin. Immunostaining for CD68 can be found in any tumor-containing lysosomal granules or phagolysosomes as in our case.4 Factor XIIIα has occasionally been reported for BFH.
Huge deep fibrous histiocytoma arising from the sigmoid mesocolon
2014, Formosan Journal of SurgeryCitation Excerpt :MDM2/CDK4 is used for liposarcomas. Malignant FH is composed of malignant pleomorphic sarcomatous cells, bizarre giant cells, and frequent mitotic figures.5 The difference between benign and malignant FH is usually obvious, because the latter is a pleomorphic, deep-seated tumor with numerous typical and atypical mitotic figures.6
Benign fibrous histiocytoma of the cheek
2013, American Journal of Otolaryngology - Head and Neck Medicine and SurgeryCitation Excerpt :As with benign FH, the diagnosis of malignant FH frequently relies upon immunohistochemistry and electron microscopy to differentiate it from other lesions. Malignant FH is composed of malignant pleomorphic sarcomatous cells, bizarre giant cells, and frequent mitotic figures [9]. The difference between benign and malignant FH is usually obvious, because the latter is a pleomorphic, deeply situated tumor with numerous typical and atypical mitotic figures and prominent areas of hemorrhage and necrosis [10].
Transformation of benign fibrous histiocytoma into malignant fibrous histiocytoma in the mandible: Case report
2011, Journal of Oral and Maxillofacial SurgeryCitation Excerpt :Although the major cause of morbidity in cutaneous BFH is excessive sun exposure, trauma and chronic infection also contribute to the development of BFH.13,22 Similar to cutaneous BFH, trauma and chronic infection contribute to the development of BFH in the bone.13,22 Some researchers have reported MFH arising secondary to trauma and chronic infection.23-27