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===Microscopic=== | ===Microscopic=== | ||
Features:<ref name=Ref_GUP581>{{Ref GUP|581}}</ref> | Features:<ref name=Ref_GUP581>{{Ref GUP|581}}</ref> | ||
*Vacuolization - ''key feature''. | *Vacuolization (cytoplasm) - '''key feature'''. | ||
*Cytoplasm - clear to eosinophilic. | *Cytoplasm - clear to eosinophilic - '''important'''. | ||
*''Reinke crystals'' - classic finding, usually not present. | |||
**Cylindrical crystalloid eosinophilic cytoplasmic bodies. | |||
*Nucleoli common. | *Nucleoli common. | ||
* | *Round nuclei. | ||
DDx: | DDx: |
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