Left lumbar pain
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A large calculus completely occupying left renal pelvis is seen it is also extending into the upper pole calyx. This represents a staghorn calculus.
Two small secondary calculi are also seen in middle calyces of the left kidney.
Staghorn calculi are composed of MAP, magnesium ammonium phosphate (struvite) and are usually mixed with calcium phosphate.
- Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics. 2004;24 Suppl 1 (suppl 1): S247-80.