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so you didn't tell us where else should we see maltese crosses!!
Sorry for the late reply:)

In Fabry's disease polarization microscopy of the sediment of urine demonstrates birefringent lipid globules (ie, renal tubular epithelial cells or cell fragments with lipid inclusions) with the characteristic Maltese cross configuration.
In Nephrotic syndrome Oval fat bodies appear as "grape clusters" under light microscopy and "Maltese crosses" under polarized light...
 

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more maltese crosses

Under polarized light, maltese crosses can be seen in urinary sediment crystals containing the following:
leucine
2,8 dihydroxyadenine
free lipid droplets containing cholesterol
triamtirene

Source: The urinary sediment. An integrated view. By Giovanni B. Fogazzi
 
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