Figure 2.

Hydroxyapatite deposits (endoscopic images) of renal papillae from patients (a) 2, (b) 3, and (c) 4. A papillary calculus was present on the papillary tip in patient 3 (arrow), and a small papillary calculus was present at the lateral position in patient 4 (arrow).

Grases et al. BMC Urology 2013 13:14   doi:10.1186/1471-2490-13-14
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