Endstage Muscle: Denervation
![](../pics/biopsy/denervation/endstage/endstgtvlp.jpg)
Gomori trichrome stain
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Pathology: Endstage muscle
Muscle fibers
Size: Small or
Pyknotic nuclear clumps
Connective Tissue
Perimysium: Most replaced by fat
Endomysium: Increased; Pseudomyopathic
Vessels: Large
Preserved within Perimysial fat
![](../pics/biopsy/denervation/endstage/endstgvvg3.jpg)
VvG stain
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![](../pics/biopsy/denervation/endstage/pseudomyophelp.jpg)
H&E stain
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![](../pics/biopsy/denervation/endstage/endstgvvg.jpg)
VvG stain
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Muscle fibers
Size: Small; Varied
Connective Tissue
Endomysium: Increased; Pseudomyopathic
![](../pics/biopsy/denervation/endstage/endstgvvg2.jpg)
VvG stain
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![](../pics/biopsy/denervation/endstage/pseudomyopvvghp2.jpg)
VvG stain
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Muscle fibers
Size: Small; Varied
Connective Tissue
Endomysium: Increased; Pseudomyopathic
![](../pics/biopsy/denervation/endstage/pseudomyopvvghp.jpg)
VvG stain
|
![](../pics/biopsy/denervation/endstage/pseudomyophemp.jpg)
H&E stain
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![](../pics/biopsy/denervation/endstage/pseudomyopvessvvgmp.jpg)
VvG stain
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Vessels
Artery: Normal
Vein: Mildly thick wall
![](../pics/biopsy/denervation/endstage/endstgnadhlp.jpg)
NADH stain
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Muscle fibers
Small muscle fibers dark stained on NADH
![](../pics/biopsy/denervation/endstage/pseudomyopnadh.jpg)
NADH stain
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Muscle fibers
Fiber types: Dark at ATPase pH 9.4
![](../pics/biopsy/denervation/endstage/endstgatp94.jpg)
ATPase pH 9.4 stain
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Muscle fibers
Lipofuscin granules: Concentrated in small muscle fibers
![](../pics/biopsy/denervation/endstage/endstgestmp.jpg)
Esterase stain
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References
1.
8/6/2022