Myopathy Immaturity Necrosis Regeneration Focal invasion Varied size Immune features Lymphocyte foci (ELS) Endomysium Perimysium Foci + Vessels Cell types Complement Endomysial pathology MHC-I Vessels Within lymphocyte foci Clinical |
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![]() Gomori trichrome stain |
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Large Small |
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![]() Gomori trichrome stain |
![]() NADH stain |
![]() Esterase stain |
![]() ATPase pH 9.4 stain |
![]() Acid phosphatase stain |
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![]() CD31 stain CD31+ endothelial cells are present in Small vessels within inflammatory foci Lumen of intermediate-sized vessel Vessels stain for ATPase (Below) ![]() ATPase pH 4.3 stain |
![]() ATPase pH 4.3 + TB stain |
Vessel in region of inflammation (Arrow) Endothelial cells Large Often Esterase+ Vessel wall: No fibrils ![]() VvG |
![]() VvG stain |
![]() VvG stain |
![]() Gomori trichrome stain |
![]() Gomori trichrome stain |
![]() Congo red stain |
![]() Esterase stain |
![]() Esterase stain |
![]() Esterase stain |
![]() Esterase stain Intermediate-sized vessels in inflammatory foci: Endothelial cells Large Stain abnormally for esterase (Arrows) & Acid phosphatase ![]() Esterase stain |
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![]() Gomori trichrome stain |
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![]() MHC Class I stain |
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Inflammation: Cell foci Cell type: Lymphocytes Location: Perimysium, Endomysium or both Myopathic changes Fiber size: Varied Endomysial connective tissue: Variably increased |
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![]() Gomori trichrome stain |
![]() VvG stain |
![]() Congo red stain |
Inflammatory cell focus Some lymphocytes are clumped Inflammatory cell focus contains intermediate-sized & small vessels ![]() H&E stain |
![]() VvG stain |
![]() Gomori trichrome stain |
![]() Congo red stain |
![]() H&E stain Small dark cells with little cytoplasm surround an intermediate sized, and several small, vessels ![]() CD20 stain CD20+ B-cells are a prominent component of some perivascular inflammatory foci. |
![]() CD4 stain |
![]() CD20 stain |
CD4 T-lymphocytes in endomysial connective tissue |
CD20 B-lymphocytes in perimysium extending into endomysium |
![]() CD4 stain CD4 T-lymphocytes Present in perimysium, extending into endomysium |
![]() CD20 stain CD20 B-lymphocytes Present in subset of inflammatory foci |
Serial sections: B-cell foci are present in some but not all (arrow) regions of CD4 cellularity | ||
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![]() CD3 stain A minority of the perivascular cells stain for CD3 (T-cells) ![]() CD68 stain CD68+ macrophages are scattered through the infiltrate and in neighboring connective tissue ![]() Acid phosphatase stain Acid phosphatase positive histiocytic cells: Scattered through the cell focus Most cells in focus are Acid phosphatase negative |
![]() C5b-9 stain |
![]() C5b-9 stain |
BCIM muscle: C5b-9 components of complement are deposited in endomysial connective tissue |
Control muscle: No C5b-9 components of complement are deposited in muscle |
C5b-9 deposits Endomysial connective tissue Necrotic muscle fibers: Cytoplasm ![]() C5b-9 stain |
IgM: Deposited on endomysial connective tissue![]() IgM stain |
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Necrotic muscle fibers: Scattered![]() H&E stain |
![]() H&E phosphatase stain |
![]() Acid phosphatase stain |
![]() H&E stain Early necrosis: Dark muscle fiber with loss of cytoplasmic structure ![]() H&E stain Later stage of necrosis: Muscle fiber invaded by cells with large nuclei and abundant foamy cytoplasm ![]() H&E stain Later stage of necrosis: Collapsed muscle fiber largely replaced by cells ![]() CD68 stain Muscle fiber necrosis: CD68+ histiocytic cells invading fiber ![]() CD68 stain Segmental muscle fiber necrosis: CD68+ histiocytic cells ![]() CD68 stain Muscle fiber necrosis: CD68+ histiocytic cells replacing part of a fiber |
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Mild-Moderate myopathy: Varied fiber size Fiber sizes: Bimodal distribution Type 1 & Type 2 fibers are small and large. ![]() H&E stain |
![]() ATPase pH 9.4 stain |
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![]() ATPase pH 4.3 stain Many muscle fibers are type 2C with intermediate staining. |
![]() ATPase pH4.3 stain |
![]() ATPase pH 4.3 stain |
![]() Alkaline phosphatase stain |
![]() NADH stain |
![]() AMPDA stain |
![]() H&E stain |
![]() Acid phosphatase stain |
![]() CD4 stain |
BCIM: MHC Class I Upregulation on muscle fibers, especially surface Expressed on cells in inflammatory foci ![]() MHC Class I stain |
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![]() From: Manu Goyal |