Dermatopathology

• I. Inflammatory Dermatitis

  A. Spongiotic Dermatitis

• Atopic Dermatitis

Seborrheic Dermatitis

Allergic Contact Dermatitis

Dyshidrotic Eczema

Stasis Dermatitis

Spongiotic Drug Reaction

Insect Bite Reaction

Incontinentia Pigmenti

Pityriasis Rosea

Photosensitive (Phototoxic/Photoallergic) Dermatitis

B. Psoriasiform and Pustular Dermatitis

Psoriasis

Reiters Syndrome

Pityriasis Rubra Pilaris

Subcorneal Pustular Dermatosis

Acute Generalized Exanthematous Pustulosis

Transient Neonatal Pustular Melanosis

Lichen Simplex Chronicus/Prurigo Nodularis

Inflammatory Linear Verrucous Epidermal Nevus

C. Interface Dermatitis

Erythema Multiforme

Toxic Epidermal Necrolysis/Stevens-Johnson Syndrome

Lupus Erythematosus

Dermatomyositis

Graft-Versus-Host Disease

Interface Dermatitis of HIV Infection

Pityriasis Lichenoides

D. Lichenoid Dermatitis

Lichen Planus

Lichenoid Drug Eruption

Fixed Drug Eruption

Lichen Striatus

Lichen Nitidus

Ashy Dermatosis (Erythema Dyschromicum Migrans)

Lichenoid Keratosis

E. Acantholytic Disorders

Pemphigus Foliaceus

Pemphigus Erythematosus

IgA Pemphigus

Pemphigus Vulgaris

Pemphigus Vegetans

Paraneoplastic Pemphigus

Dariers Disease

Hailey-Hailey Disease (Familial Benign Pemphigus)

Grovers Disease (Transient Acantholytic Dermatosis)

F. Subepidermal Vesicular Dermatitis

Bullous Pemphigoid

Herpes Gestationis

Cicatricial Pemphigoid

Epidermolysis Bullosa Acquisita

Epidermolysis Bullosa Congenita

Dermatitis Herpetiformis

Linear IgA Disease

Porphyria Cutanea Tarda

Pseudoporphyria

G. Granulomatous Dermatitis

Granuloma Annulare

Necrobiosis Lipoidica

Rheumatoid Nodule

Palisaded Neutrophilic Granulomatous Dermatitis (Interstitial Granulomatous Dermatitis with Arthritis)

Necrobiotic Xanthogranuloma

Sarcoidosis

Cutaneous Crohns Disease

Foreign Body Reaction

H. Superficial and Superficial and Deep Perivascular Dermatitis

Erythema Annulare Centrifigum

Urticaria

Polymorphous Light Eruption

I. Folliculitis, Perifolliculitis, and Inflammation of the Sweat Apparatus

Acne Vulgaris

Rosacea

Hidradenitis Suppurativa

Acne Agminata

Folliculitis

Eosinophilic Folliculitis

Neutrophilic Eccrine Hidradenitis

Acne Keloidalis Nuchae

J. Alopecia

Alopecia Areata

Androgenetic Alopecia

Dissecting Cellulitis

Follicular Degeneration Syndrome

Folliculitis Decalvans

Lichen Planopilaris and Frontal Fibrosing Alopecia

K. Vasculitis and Vasculopathy

Leukocytoclastic Vasculitis

Henoch-Schönlein Purpura (HSP)

Urticarial Vasculitis

Granuloma Faciale

Erythema Elevatum Diutinum

Polyarteritis Nodosa

Wegeners Granulomatosis

Churg-Strauss Syndrome (Allergic Granulomatosis with Angiitis)

Disseminated Intravascular Coagulation

Cryoglobulinemia

Antiphospholipid Antibody Syndrome

Coumadin Necrosis

Cholesterol Crystal Embolism

Giant Cell Arteritis

Atrophie Blanche

Lymphocytic Vasculitis

Perniosis

Degos Disease

Pigmented Purpura

L. Fibrosing/Sclerosing Dermatitis

Morphea

Scleroderma

Lichen Sclerosus

Nephrogenic Systemic Fibrosis (Nephrogenic Fibrosing Dermopathy)

Radiation Dermatitis

M. Panniculitis

Erythema Nodosum

Alpha-1 Antitrypsin Deficiency Associated Panniculitis

Pancreatic Panniculitis

Subcutaneous Fat Necrosis of the Newborn

Nodular Vasculitis

Lupus Profundus

Factitial and Traumatic Fat Necrosis

Lipodermatosclerosis (Sclerosing Panniculitis)

Infective Panniculitis

N. Other Inflammatory Dermatoses

Sweets Syndrome

Pyoderma Gangrenosum

Behçets Disease

Eosinophilic Cellulitis (Wells Syndrome)

Eosinophilic Fasciitis

Zoons Balanitis

O. Disorders of Keratinization

Ichthyosis Vulgaris

Sex-Linked Ichthyosis

Lamellar Ichthyosis

Congenital Bullous Ichthyosiform Erythroderma

Palmoplantar Keratoderma

Porokeratosis

Axillary Granular Parakeratosis

II. Infectious Dermatitis

A. Viral Infections

Verruca Vulgaris

Verruca Plantaris (Plantar Wart)

Verruca Plana (Plane Wart)

Condyloma Accuminatum

Molluscum Contagiosum

Herpes Simplex

Varicella-Zoster Virus

Orf (Echthyma Contagiosum)

B. Bacterial Infections

Impetigo

Staphylococcal Scalded Skin Syndrome

Necrotizing Fasciitis

Ecthyma

Bacillary Angiomatosis

Actinomycosis

Granuloma Inguinale

Anthrax

Corynebacterial infections

Lyme Disease

Syphilis

Lupus Vulgaris

Atypical Mycobacterial Infections

Leprosy

C. Fungal Infections

Dermatophytosis

Tinea Versicolor

Candidiasis

Pityrosporum Folliculitis

Mycetoma

North American Blastomycosis

Histoplasmosis

Cryptococcosis

Coccidiodomycosis

Paracoccidiodomycosis (South American Blastomycosis)

Chromoblastomycosis (Chromocycosis)

Phaeohyphomycosis

Sporotrichosis

Aspergillosis

Zygomycosis

D. Other Infections

Protothecosis

Rhinosporidiosis

Leishmaniasis

Amoebiasis Cutis

Onchocerciasis

Schistosomiasis

Scabies

Tungiasis

III. Non-Inflammatory Dermatoses

A. Metabolic and Degenerative Disorders

Necrolytic Migratory Erythema

Acrodermatitis Enteropathica

Cutaneous Amyloidosis

Adult Colloid Milium

Juvenile Colloid Milium

Gout

Lichen Myxedematosus/Scleromyxedema

Scleredema (Buschke)

Pretibial Myxedema

Follicular Mucinosis

Calcinosis Cutis

Calciphylaxis

Chondrodermatitis Nodularis Helicis

B. Diseases of Collagen and Elastic Tissue

Pseudoxanthoma Elasticum

Elastosis Perforans Serpiginosa

Reactive Perforating Collagenosis

Kyrles Disease (Hyperkeratosis Follicularis et Parafollicularis in Cutem Penetrans)

C. Disorders of Pigmentation

Vitilgo

Drug-Induced Pigmentation

IV. Neoplasms

A. Cysts and Pseudocysts

Dilated Pore of Winer

Epidermoid Cyst

Pilar Cyst

Proliferating Pilar Tumor

Steatocystoma

Eruptive Vellus Hair Cyst

Hidrocystoma

Cutaneous Ciliated Cyst

Dermoid Cyst

Digital Myxoid Cyst

B. Melanocytic Neoplasms

Ephelis

Lentigo

Ink Spot Lentigo

Labial Melanotic Macule

Melanocytic Nevus

Acral Nevus

Congenital Melanocytic Nevus

Halo Nevus

Balloon Cell Nevus

Recurrent (Persistent) Nevus (Pseudomelanoma)

Atypical Genital (Milk-Line, Flexural) Nevus (Nevus of Special Anatomic Sites)

Dysplastic Nevus

Spitz Nevus

Pigmented Spindle Cell Nevus (Reed Nevus)

Nevus of Ota (Nevus Fusoceruleus Ophthalmomaxillaris) and Nevus of Ito (Nevus Fusoceruleus Acromioclavicularis)

Blue Nevus

Combined Nevus

Deep Penetrating Nevus

Melanoma

C. Keratinocytic Neoplasms

Epidermal Nevus

Seborrheic Keratosis

Inverted Follicular Keratosis

Stucco Keratosis

Borst-Jadasshon phenomenon

Large Cell Acanthoma

Acantholytic Acanthoma

Warty Dyskeratoma

Clear Cell Acanthoma

Actinic Keratosis

Squamous Cell Carcinoma

Squamous Cell Carcinoma In Situ

Keratoacanthoma

Verrucous Carcinoma

Basal Cell Carcinoma

D. Follicular Neoplasms

Trichoepithelioma

Desmoplastic Trichoepithelioma

Trichilemmoma

Desmoplastic Trichilemmoma

Tumor of the Follicular Infundibulum (Infundibuloma)

Pilar Sheath Acanthoma

Basaloid Follicular Hamartoma

Trichoblastoma

Trichofolliculoma

Pilomatrixoma

Lymphadenoma Cutis

Trichilemmal Carcinoma

Matrical Carcinoma (Pilomatrix Carcinoma, Malignant Pilomatrixoma)

E. Sebaceous Neoplasms

Nevus Sebaceus of Jadasshon (Organoid Nevus)

Sebaceous Hyperplasia

Sebaceous Adenoma

Sebaceoma

Sebaceous Carcinoma

F. Eccrine/Apocrine Neoplasms

Poroma

Dermal Duct Tumor

Eccrine Syringofibroadenoma (Acrosyringeal Nevus)

Syringoma

Nodular Hidradenoma

Chondroid Syringoma (Mixed Tumor)

Eccrine Spiradenoma

Cylindroma

Syringocystadenoma Papilliferum

Hidradenoma Papilliferum

Tubular Apocrine Adenoma (Papillary Tubular Adenoma)

Papillary Eccrine Adenoma

Microcystic Adnexal Carcinoma

Adenoid Cystic Carcinoma

Eccrine Porocarcinoma

Primary Cutaneous Mucinous Carcinoma

Hidradenocarcinoma (Malignant Acrospiroma, Clear Cell Hidradenocarcinoma)

Eccrine Ductal Carcinoma

Aggressive Digital Papillary Adenocarcinoma

Apocrine Carcinoma

G. Fibrous, Fibrohistiocytic, and Myofibroblastic Neoplasms

Hypertrophic Scar

Keloid

Fibrous Papule

Acrochordon (Fibroepithelial Polyp, Skin Tag)

Acquired Digital Fibrokeratoma

Superficial Angiomyxoma

Palmar Fibromatosis (Dupuytrens Contracture)

Nodular Fasciitis

Elastofibroma

Fibroma of Tendon Sheath

Giant Cell Tumor of Tendon Sheath

Inclusion Body Fibromatosis (Infantile Digital Fibromatosis)

Fibrous Hamartoma of Infancy

Sclerotic Fibroma (Storiform Collagenoma)

Infantile Myofibromatosis and Solitary Myofibroma

Myoepithelioma

Solitary Fibrous Tumor

Dermatofibroma (Benign Fibrous Histiocytoma)

Cellular Fibrous Histiocytoma

Atypical Fibrous Histiocytoma

Dermatomyofibroma

Dermatofibrosarcoma Protuberans (DFSP)

Giant Cell Fibroblastoma

Atypical Fibroxanthoma

Superficial Malignant Fibrous Histiocytoma (Superficial Pleomorphic Sarcoma-NOS)

Epithelioid Sarcoma

H. Vascular Neoplasms

Intravascular Papillary Endothelial Hyperplasia (Massons Tumor)

Lobular Capillary Hemangioma (Pyogenic Granuloma)

Port-Wine Stain

Infantile Hemangioma (Strawberry Nevus, Juvenile Hemangioma, Infantile Hemangioendotheioma)

Cavernous Hemangioma

Arteriovenous Hemangioma (Arteriovenous Malformation, Cirsoid Aneurysm)

Cherry Hemangioma (Senile Hemangioma, Campbell de Morgan Spot)

Angiokeratoma

Hobnail Hemangioma (Targetoid Hemosiderotic Hemangioma)

Spindle Cell Hemangioma

Multinucleate Cell Angiohistocytoma

Epitheliod Hemangioma (Angiolymphoid Hyperplasia with Eosinophilia)

Reactive Angioendotheliomatosis

Lymphangioma Circumscriptum

Glomus Tumor/Glomangioma

Myopericytoma

Epithelioid Hemangioendothelioma

Kaposis Sarcoma

Cutaneous Angiosarcoma

Epithelioid Angiosarcoma

I. Neural-Neuroendocrine Neoplasms

Traumatic Neuroma

Mortons Neuroma (Metatarsalgia)

Neurofibroma

Schwannoma (Neurilemmoma)

Palisaded Encapsulated Neuroma (Solitary Circumscribed Neuroma)

Granular Cell Tumor

Neurothekeoma (Myxoid Neurothekeoma, Dermal Nerve Sheath Myxoma)

Cellular Neurothekeoma

Perineurioma

Nasal Glioma

Malignant Peripheral Nerve Sheath Tumor (Neurofibrosarcoma, Malignant Schwannoma)

Merkel Cell Carcinoma

J. Muscular Neoplasms

Leiomyoma and Angioleiomyoma

Leiomyosarcoma

K. Adipose, Osseous, and Cartilaginous Neoplasms

Lipoma

Angiolipoma

Spindle Cell Lipoma

Pleomorphic Lipoma

Liposarcoma

Osteoma Cutis

Soft Tissue Chondroma

L. T-Cell (and NK/T-Cell) Neoplasms

T-Cell Pseudolymphoma

Chronic Actinic Dermatitis (Actinic Reticuloid)

Mycosis Fungoides

Sézary Syndrome

Pagetoid Reticulosis

Granulomatous Slack Skin

Primary Cutaneous CD8-Positive Epidermotropic Cytotoxic T-Cell Lymphoma

Lymphomatoid Papulosis

Anaplastic Large Cell Lymphoma

Subcutaneous Panniculitis-Like T-Cell Lymphoma

Adult T-Cell Leukemia/Lymphoma (ATLL)

Extranodal NK/T-Cell Lymphoma, Nasal Type

Gamma/Delta T-Cell Lymphoma

M. B-Cell Neoplasms

B-Cell Pseudolymphoma (Cutaneous Lymphoid Hyperplasia)

Primary Cutaneous Marginal Zone Lymphoma (MALT)

Follicle Center Cell Lymphoma (FCCL)

Diffuse Large B-Cell Lymphoma

Intravascular Large B-Cell Lymphoma

Lymphomatoid Granulomatosis

N. Histiocytic, Xanthomatous, Mast Cell, Plasma Cell, and Myeloid Neoplasms

Xanthomata

Xanthogranuloma (Juvenile)

Xanthoma Disseminatum

Verruciform Xanthoma

Rosai-Dorfman Disease

Reticulohistiocytoma

Langerhans Cell Histiocytosis

Cutaneous Mastocytosis

Leukemia Cutis

Plasmacytoma

O. Cutaneous Metastases/Implantation

Cutaneous Endometriosis

Cutaneous Metastases

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