Case report: A rare case of retroperitoneal mixed type unicentric Castleman disease

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A 52-year-old woman presented with increased urination and was diagnosed with retroperitoneal mixed type unicentric Castleman disease.
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The patient underwent laparoscopic resection of the retroperitoneal tumor, which was confirmed as mixed type unicentric Castleman disease postoperatively.
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Castleman disease is a rare benign lymphoproliferative disorder, with unicentric cases often misdiagnosed due to nonspecific symptoms.
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Histopathological examination revealed reactive hyperplasia of lymphoid tissue, highlighting the unique features of mixed type unicentric Castleman disease.
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Increased awareness and thorough investigation are essential for the recognition and management of retroperitoneal mixed type unicentric Castleman disease.

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