Created at 12:25 a.m. Jan, 08, 2026
Author:
Skylar
Type of change:
Updated content
Rationale for change
The stains should be the flashcard, not +/- -- it's more helpful for the test
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Histology: interstitial "fibrohistiocytic" infiltrate in mid-deep dermis, collagen trapping (best seen at periphery), follicular and epidermal induction, and Touton giant cells containing hemosiderin (ringed sideroblasts)
Mimics in ddx: DFSP (infiltrates fat deeply [honeycombing pattern], lacks follicular and epidermal induction, lacks giant cells with hemosiderin; stains CD34+, factor XIIIa-, and stromelysin 3-)
Mimics in ddx: DFSP (infiltrates fat deeply [honeycombing pattern], lacks follicular and epidermal induction, lacks giant cells with hemosiderin; stains CD34+, factor XIIIa-, and stromelysin 3-)
Personal Notes
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Missed Questions
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DermPath
Images courtesy of Tammie Ferringer
Images courtesy of Tammie Ferringer
Dermoscopy
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VisualDx
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DermNet
Factor XIIIa
Factor XIIIa
Full Spectrum of Dermatology
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Dermnemonics
Sword (1) and Heart (3): DFs Stain positive for Factor XIIIa
Dermatographix
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Textbook
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Additional Resources
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One by one
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