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Year : 1997  |  Volume : 13  |  Issue : 1  |  Page : 15-20

Value of detailed structural study of urinary calculi


Sujoy Urological Hospital, Vadodara, India

Correspondence Address:
A D Bhandarkar
Sujoy Urological Hospital, Vadodara
India
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Source of Support: None, Conflict of Interest: None


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Thin section polarising microscopy was used to study the structure and composition of 300 urinary calculi. The commonest structural form was the crystalline pattern in 112 (37 percent) calculi. This was followed by radially striated compact pattern in 67 (22.3 percent) calculi. Whewellite, the most common stone mineral (87 percent) was found in three different structural patterns. 59 percent of calculi had central nuclei, whereas, 7 percent of them had an eccentric nucleus. In the remainder 21 percent, nuclei were not clearly discernible. Majority of calculi had microcrystalline material in their nuclei, supporting the role of primary agglomeration as mechanism of stone formation. Variable crystal aggregation behavior observed in the study suggests more than one mechanism of calculogenesis. In addition to gaining insight into the etiopathogenesis of urolithiasis, structural studies of urinary calculi can help to explain varied response of a calculus to various fragmentation techniques, and especially ESWL.


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