Histiocytic sarcoma of the neck: A case report

Histiocytic sarcoma of the base of tongue treated with radical radiotherapy: A case report and review of the literature

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First report in literature of curative management with radiotherapy for histiocytic sarcoma.

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Radiotherapy to localised base of tongue histiocytic sarcoma was well tolerated.

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No evidence of relapse following 5 years follow up.

Histiocytic sarcoma (HS) is an exceedingly rare and aggressive neoplasm of lymphoid and haematopoietic tissues and expresses histological and phenotypical characteristics of mature histiocytes. There have only been a few cases of documented HS in the head and neck region. Whilst patients with HS often have nodal or disseminated disease, patients can present with localised disease. There are currently no established treatment guidelines, and reported cases of localised disease have been managed with primary surgery and adjuvant radiotherapy and/or chemotherapy. Here we present, the case of a 49 year old man with a HS of the base of tongue treated with radical radiotherapy to a dose of 60 Gy in 30 fractions, achieving disease free survival of greater than 5 years with minimal toxicity. To our knowledge, this is the first reported case of HS treated with radical radiotherapy, and suggests that when the potential morbidity of surgery for localised disease is significant, radiotherapy may represent an alternative treatment.

Primary Histiocytic Sarcoma Presenting as a Breast Mass: A Case Report

Histiocytic sarcoma is a rare hematologic malignancy, with very few cases of primary histiocytic sarcoma of the breast described in English scientific literature. Herein, we describe a case of primary histiocytic sarcoma of the breast in a 75-year-old woman, with no clinical history of malignant tumors, who presented with a palpable solitary breast mass. Microscopically, the resected breast mass showed large pleomorphic cells, some multinucleated giant cells, and admixed inflammatory components. The pleomorphic tumor cells further showed a diffuse, noncohesive growth pattern, an abundant eosinophilic cytoplasm, and strong and diffuse immunoreactivity for cluster of differentiation (CD) 68 and CD163. Furthermore, a whole-body positron-emission tomography/computed tomography using deoxy-2-[¹⁸F]fluoro-D-glucose performed after surgery showed no other masses or lesions. After surgical excision, the patient was followed up, and no evidence of tumor recurrence or metastasis was noted.