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Fibrohistiocytic Skin Tumors 101 (Australasian Dermatopathology Society 2022 meeting) pathology

This lecture was presented virtually at the 2022 Australasian Dermatopathology Society Meeting. Diagnoses & Timestamps: Dermatofibroma 101 - 1:26 Cellular dermatofibroma 12:31 Large deep aneurysmal dermatofibroma 17:15 Dermatofibroma with scattered pleomorphism (“monster cells”) 21:07 (note: this is NOT the same as atypical fibrous histiocytoma! See this video: https://kikoxp.com/posts/4272 ) Lipidized dermatofibroma (ankle type DF) 24:04 CD34+ “Halo” around dermatofibroma (don’t confuse with DFSP!) 26:03 Factor XIIIa staining in dermatofibroma 30:24 Dermatofibrosarcoma protuberans (DFSP) 101 - 34:37 Fibrosarcomatous DFSP (FS-DFSP) – 42:00 Acceptable uses of “fibrosarcoma” in modern pathology 43:25 (hint: herringbone pattern is usually NOT fibrosarcoma! Giant cell fibroblastoma (pediatric variant of DFSP) 46:35 Fibrous hamartoma of infancy 50:16 Not all honeycomb fat entrapment is DFSP! Tips for distinguishing DFSP vs mimics & Discussion of how/when I use FISH for DFSP 53:15 Myofibroma 55:27 Myofibroma with atypical features 59:59 Inclusion body fibromatosis 01:01:18 Giant cell tumor of tendon sheath (tenosynovial giant cell tumor, localized type) 01:02:46 Hemosiderin halos (ladybird cells) in giant cell tumor of tendon sheath 01:08:14 Nodular fasciitis 01:10:26 Juvenile xanthogranuloma (JXG) 01:18:32 Reticulohistiocytoma (solitary epithelioid histiocytoma) & Reticulohistiocytosis 01:21:58 Langerhans cell histiocytosis (01:24:24) Langerhans cell histiocytosis vs mastocytosis 01:25:23 Indeterminate cell histiocytosis 01:27:00 Rosai-Dorfman disease 01:28:00 Mycobacterial spindle cell pseudotumor 01:32:03 A complete organized library of all my videos, digital slides, pics, & sample pathology reports is available here: https://kikoxp.com/posts/5084 (dermpath) & https://kikoxp.com/posts/5083 (bone/soft tissue sarcoma pathology). You might like my Twitter/social media 101 guide: https://kikoxp.com/posts/15217. I also highly recommend creating a professional profile on KiKo (it’s free! Here’s mine: https://kikoxp.com/jerad_gardner1). Please check out my Soft Tissue Pathology & Dermatopathology survival guide textbooks. A look inside & info about where to buy them here: https://kikoxp.com/posts/17787 This video is geared towards medical students, pathology or dermatology residents, or practicing pathologists or dermatologists. Of course, this video is for educational purposes only and is not formal medical advice or consultation. Presented by Jerad M. Gardner, MD. Please subscribe to my channel to be notified of new pathology teaching videos. Follow me on: Snapchat: JMGardnerMD Twitter: @JMGardnerMD Mastodon: @[email protected] Instagram: @JMGardnerMD Kiko: https://kikoxp.com/profile/jerad_gard... Facebook:   / jmgardnermd