ArticlePathology international2025
Follicular Dendritic Cell Sarcoma of the Parapharyngeal Space Arising in Association With Castleman Disease.
Article in Pathology international, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
Follicular dendritic cell sarcoma (FDCS) is a rare malignant neoplasm of follicular dendritic cell origin. It is occasionally associated with unicentric Castleman disease (UCD), particularly the hyaline-vascular (HV) variant (HV-UCD). We report a 56-year-old woman with FDCS arising in the parapharyngeal space in the background of HV-UCD. The patient presented with a painless right neck mass and extensive cervical lymphadenopathy without systemic symptoms. Surgical resection of the parapharyngeal mass revealed FDCS in the lymph nodes with features of HV-UCD. Immunohistochemistry confirmed the follicular dendritic cell lineage of the lesional cells, with positivity for CD21 and CD23. Subsequent lymph node dissection from levels 2A, 2B, 3, and 4 showed features of HV-UCD without residual FDCS. This case highlights the diagnostic challenge FDCS represents, particularly when arising in an unusual location. While complete surgical excision remains the standard of care, long-term follow-up is necessary to monitor for recurrence or metastasis.
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