Abstract
Langerhans cell histiocytosis (LCH) can be associated with a variety of malignant neoplasms, the most common being malignant lymphoma, especially Hodgkin lymphoma (HL). In the present report we describe the fine needle aspiration (FNA) cytologic features of a case with concurrent LCH and HL in a lymph node. A 20-year-old man presented with an enlarged left upper cervical lymph node. FNA smears from the swelling revealed numerous CD1a+ and S-100+ Langerhans histiocytes (LCs) along with many eosinophils, neutrophils, and lymphocytes; there were also large atypical cells with enlarged nuclei having prominent nucleoli. The cytodiagnosis was LCH and the possibility of association with or trans-differentiation into a lymphoma was suggested. The histopathological diagnosis of the excised lymph node was classical Hodgkin lymphoma-nodular sclerosis type (CHL-NS) with LCH. The lacunar type Reed-Sternberg (RS) cells were positive for CD30 and CD15 while the LCs were positive for CD1a and S-100 protein. PET/CT imaging of vertex to mid-thigh demonstrated hypermetabolic lymph nodes in the neck, abdomen, thorax and pelvis as well as pulmonary nodules and a splenic mass. The patient received courses of chemotherapy and two years later, the enhanced CT of neck, chest, abdomen and pelvis revealed regressive course of the disease.
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