My Method for Approaching Skin Biopsies

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1 My Method for Approaching Skin Biopsies P A U L H A U N, MD, MS, F A A D A S S I S T A N T P R O F E S S O R D E R M A T O L O G Y A N D D E R M A T O P A T H O L O G Y D E P A R T M E N T O F D E R M A T O L O G Y U N I V E R S I T Y O F P E N N S Y L V A N I A C M C V A M C, P H I L A D E L P H I A

2 Disclosure Royalties from Health Press, Inc Fast Facts: Diagnosing Cutaneous T-Cell Lymphoma (P Haun and J Scarisbrick)

3 Q1: Quick Audience Survey: A) Medical Student B) Dermatology Resident C) Pathology Resident D) Dermpath Fellow E) NP/PA in Dermatology F) Practicing Dermatologist/Dermatopathologist

4 Remember Don t make it too difficult Pattern recognition You are becoming a master of this skill All of these conditions exist clinically Utilize your knowledge from clinic while studying path and vice versa What will the biopsy look like of this eruption? Learn the vocabulary of dermatopathology

5 Inflammatory Dermatopathology Pick an approach/algorithm/process Stick to It! We all do it some of us are just quicker than others Low Power Magnification=High Power Thinking Read the slide like a book tell the biopsy s story Stratum Corneum>Epidermis>Dermis>Subcutis Architecture/Pattern Cell Types

6 My Approach 1 st Question: Method of Biopsy Punch=Inflammatory Shave/Excision=Neoplastic

7 My Approach 2 nd Question: Inflammatory vs. Neoplastic Can be one of the most difficult questions Overlap can occur 3 rd Question: Anatomic Site Can give a great deal of information again, go back to your clinical training Assists in ruling in/ruling out certain conditions Can tie together a difficult histopathology case

8 Patterns Superficial Perivascular Superficial and Deep Perivascular Nodular Diffuse Vasculitis Intraepidermal Vesicular Subepidermal Vesicular Folliculitis/Perifolliculitis Fibrosing Panniculitis Alopecia Others Depositions Infestations DDx Patterns

9 Superficial Perivascular No Epidermal Change Interface Vacuolar Lichenoid Spongiotic Spongiotic Psorasiform Lichenoid Psoriasiform +/- Lichenoid Ackerman, et al. Histologic Diagnosis of Inflammatory Skin Diseases. 2 nd Ed. 1997

10 Superficial and Deep Perivascular Similar Patterns to SPV No Epidermal Involvement Interface Vacuolar Lichenoid Ballooning Spongiotic Psoriasiform

11 Prototypes and DDx (some) Superficial Perivascular Normal Skin Differential Urticaria Dermatophyte Atopic Dermatitis Allergic/Irritant Contact Lichen Planus PLEVA Erythema Multiforme Dermatomyositis/Lupus Psoriasis Syphillis Prurigo/LSC Superficial and Deep Perivascular Polymorphous Light Eruption Pernio/chilblains Arthropod assult Fixed Drug Eruption DLE Mycosis Fungoides/LyP Lichen Striatus B-cell lymphoproliferative d/o Necrobiosis lipoidica

12 Nodular Look for the cell type Lymphocytes Neutrophils Mixed Neuts/Eos Histiocytes Sarcoidal Tuberculoid Palisaded Suppurative

13 Diffuse Much overlap with nodular patterns Will discuss together

14 Nodular/Diffuse Lymphocytic Neutrophilic and Mixed Lymphoma Pseudolymphoma/CLH Sweets Syndrome Leukocytoclastic vasculitis GPA/GPA with Eos Acne keloidalis/dissecting cellulitis Granuloma faciale/erythema elevatum diutinum

15 Nodular/Diffuse--Histiocytic Sarcoidal Tuberculoid Foreign body reaction Sarcoidosis Rosacea Leprosy Lichen striatus TB and its many flavors Leishmaniasis Syphillis

16 Nodular/Diffuse Histiocytic Palisaded Suppurative Granuloma annulare Necrobiosis lipoidica Necrobiotic xanthogranuloma Rheumatoid nodule Gout Ruptured cyst Foreign body reaction Infection Infection Infection

17 Vasculitis Small-Medium vs. Large Vessel Vessel Type +/- Neutrophils +/- Fibrin +/- Organisms Vasculitis vs. Vasculopathy

18 Vasculitis/Vasculopathy Vasculitis Small Vessel Drug Malignancy Infection Literally hundreds of other causes Degos Medium-Large GPA PAN Nodular Vasculitis Vasculopathy/Occlusion DIC TTP/ITP Coumadin necrosis PNH Anti-phospholipid Ab Cholesterol emboli Catheter sheathing

19 Intraepidermal Vesicular Balooning Spongiosis Acantholysis Upper spinous Mid spinous Suprabasal Pustular Look for the deepest level involved Intracorneal Subcorneal Spongiotic **Know you DIF Patterns**

20 Intraepidermal Vesicular Balooning Spongiosis HSV/VZV Orf Vaccinia Nutritional Deficiency Hand-foot-mouth EM PLEVA ACD/ICD Dyshidrosis Dermatophyte EM BP PV Fixed Drug

21 Intraepidermal Vesicular Acantholysis Suprabasal Upper Spinous Bullous impetigo Pemphigus foliaceous Staph scalded skin Mid Spinous HSV/VZV Dariers Grovers Pemphigus vulgaris Hailey-Hailey Pustular Dermatophyte, Candida, Psoriasis, Impetigo, PF, SSSS, ACD, Dyshidrosis

22 Subepidermal Vesicular Look for the Cell Type Paucicellular Lymphocytes Eosinophils Neutrophils Mixed Mast Cells **Know you DIF Patterns**

23 Subepidermal Vesicular Paucicellular Lymphocytes Epidermolysis bullosa Burn EM GVHD PCT Amylodosis Cautery EM LSetA PLEVA Lichen Planus

24 Subepidermal Vesicular Neutrophils Mixed Dermatitis herpetiformis Linear IgA Bullous lupus LCV Infection DH BP Linear IgA EBA

25 Folliculitis Infectious Acne Rosacea Eosinophilic Mycosis fungoides Toxic erythema

26 Perifolliculitis Discoid Lupus Lichen planopilaris Rosacea Keratosis pilaris Scurvy

27 Fibrosing Fibrosis: Increased fibrocytes Thinner collagen bundles Sclerosis: Decreased fibrocytes Thickened/homogenized collagen

28 Panniculitis Septal (mostly) +/- Vasculitis Lobular (mostly) +/- Vasculitis

29 Panniculitis Septal Erythema nodosum* LCV PAN GA Rheumatoid nodule Necrobiotic xanthogranuloma Lobular Nodular vasculitis Sclerema neonatorum Subcutaneous fat necrosis Cold panniculitis Lymphoma Pancreatic panniculitis Factitial Infection Sarcoidosis Trauma

30 Alopecia Scarring or not Normal=~6 follicles per 4mm punch Inflammatory or not Cell Types Hair counts Catagen Telogen Anagen

31 Alopecia Inflammatory** Non-inflammatory Alopecia areata Lichen planopilaris DLE Morphea Tinea capitis Folliculitis decalvans Dissecting cellulitis Androgenetic Telegen effluvium Traction Trichtillomania **Late stage disease can have sparse inflammation **Significant overlap can occur

32 Patterns Superficial Perivascular Superficial and Deep Perivascular Nodular Diffuse Vasculitis Intraepidermal Vesicular Subepidermal Vesicular Folliculitis/Perifolliculitis Fibrosing Panniculitis Alopecia Others Depositions Infestations DDx Patterns

33 Others Normal skin Massive papillary dermal edema Eosinophilic spongiosis Deposition/Metabolic

34 THANK YOU! Questions:

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