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Accumulation of foam cells (FC) in the interstitium of the kidney. Renal FCs display phenotypic characteristics of macrophages and belong to the monocyte/macrophage lineage. Histologically, renal FCs are characterized by round cells with small nuclei and an abundant PAS-positive cytoplasm with lipid-containing vacuoles. [PMID:19672113, PMID:25887903]
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