A case of a patient who developed multiple calcium oxalate dihydrate calculi, some of them connected to intratubular calcifications (Randall's plugs), is presented. Randall's plugs were isolated and studied. The mechanism of Randall's plug development is also suggested.

Laboratory of Renal Lithiasis Research University Institute of Health Sciences Research University of Balearic Islands Palma of Mallorca Spain

University of J E Purkyně Faculty of Environmental Studies Ústí n L Czech Republic

Urology Service Hospital de Manacor Mallorca Spain

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Can Randall's plug composed of calcium oxalate form via the free particle mechanism?