Presentation
Recurrent bilateral flank pain.
Patient Data
Age: 40 years
Gender: Female
From the case:
Pure matrix renal stones
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No obvious dense renal stones.
From the case:
Pure matrix renal stones
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Multiple bilateral renal hyperechoic foci with posterior acoustic shadowing and twinkling artifact, suggesting renal stones.
Case Discussion
Almost all renal stones are radiodense and can be visualised through radiography or computed tomography. However, there are two rare types of renal stones that appear radiolucent: pure/protein matrix stones and some medication-induced stones.
Matrix stones may appear echogenic on ultrasound however acoustic shadowing and twinkle artefact is variable and probably depends on the extent of mineralisation.
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