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Castleman's disease is a rare disease characterized by unicentric or multicentric enlargement of the lymph node, and it is mostly of the hyaline vascular type. Calcifying fibrous tumor is a neoplasm characterized by large areas of hyalinized collagen with paucicellular areas along with dystrophic calcification and scattered lymphoplasmacytic infiltrates. There are only five case reports to describe an association between these two entities. We report a case of a 38-year-old male with seropositivity for hepatitis B virus presenting with a right-sided cervical swelling. Fine-needle aspiration cytology (FNAC) was done, and a diagnosis of follicular hyperplasia was offered. Biopsy confirmed the diagnosis of Castleman's disease. However, there was associated calcifying fibrous tumor in the lymph node induced by trauma due to FNAC.