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Soft tissue
Fibroblastic / myofibroblastic tumors
Proliferative myositis

Reviewer: Meggen Walsh, M.D. (see Reviewers page)
Editor: Jerad M. Gardner, M.D.
Revised: 9 June 2013, last major update June 2013
Copyright: (c) 2002-2013, PathologyOutlines.com, Inc.

Definition
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Epidemiology
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Sites
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Pathophysiology
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Etiology
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Treatment
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Gross description
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Micro description
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Micro images
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Images from AFIP:
Characteristic checkerboard pattern is produced by reactive proliferation expanding spaces between muscle bundles and individual muscle fibers
With metaplastic bone, resembling myositis ossificans
Large ganglion cells with crowding and molding resembling carcinoma
Cells have abundant amphophilic cytoplasm and prominent nucleoli
Other images:
Ganglion cells

Spindle cell sarcoma resembling proliferative fasciitis - AFIP:
Figure 1
Figure 2
Fig 1: Checkerboard pattern produced by infiltration of tumor cells between muscle bundles without myocyte necrosis
Fig 2: Cellular proliferation of atypical spindle cells differs from bland spindle cells of proliferative myositis

Cytology description
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Positive stains
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Negative stains
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Electron microscopy description
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Differential diagnosis
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End of Soft tissue > Fibroblastic / myofibroblastic tumors > Proliferative myositis


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