PMC8265241_01
intraoperative aspect; white arrow: Castleman tumor; yellow arrow: pancreatic head; green arrow: duodenum
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F1
Intraoperatively, there was a well-encapsulated soft-tissue mass measuring 3.5 x 2.5 x 1.5cm, firm in consistency and deriving blood supply from multiple sources (Figure 1).
histological examination; Castleman's disease of hyaline vascular type
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F2
In interfollicular sectors, multiple hyaline vascular structures were noticed, giving "lollipop" appearance (Figure 2).
immunohistochemical staining positive for CD20+
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F3
Immunohistochemical study revealed that tumor cells were positive for CD20+ mainly in the follicular regions (Figure 3).