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| **Perinuclear clearing/quasi koilocytic appearance. | | **Perinuclear clearing/quasi koilocytic appearance. |
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| ==Crystals== | | ==Crystals in fluids== |
| ===Joint crystals===
| | {{main|Crystals in fluids}} |
| Types:<ref>TN05 RH6</ref>
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| *Gout = needle-shaped, negatively birefringent, yellow when aligned.
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| *Pseudogout = rhomboid-shaped, positively birefringent, blue when aligned.
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| Notes:
| | The above article covers gout, pseudogout and urine crystals. |
| *Pseudogout also known as CPPD = calcium pyrophosphate dehydrogenase.
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| *Memory device: ''ABC+'' = ''a''ligned ''b''lue is ''c''alcium - positively birefringent.
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| ===Urine crystals===
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| Types:
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| *Envelope shape (calcium oxalate).
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| *Diamond shape (uric acid).
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| *Coffin-lid shape (struvite).
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| *Hexagonal shape (cysteine).
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| Notes:
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| *Memory device: ''Diamonds'' are see-through; ergo, uric acid stones not seen on KUB.
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| *Uric acid crystals: usually dissolve in formulin... but do not dissolve in alcohol.<ref>WG. 8 January 2010.</ref>
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| ==Skin== | | ==Skin== |