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Paraganglioma with organoid/nested (Zallballen) pattern; nests separated by vascularized, thin fibrous septa (H&E, original magnification ×40).
Lower left inset:
Large polygonal tumor cells with granular cytoplasm, pleomorphic and bizarre nuclei with prominent nucleoli; occasional (arrow) intranuclear inclusions are present (H&E, original magnification ×400).
Lower right inset:
Vascular invasion (arrow) in paraganglioma (H&E, original magnification ×40).
