Atlas of Clinical Dermatopathology. Infectious and Parasitic Dermatoses

1 Bacterial Infections  4

1.1. Staphylococcal and Streptococcal Infections. 4

1.1.1 Impetigo Contagiosa. 4

1.1.2 Ostiofolliculitis (Bockardt). 5

1.1.3 Pseudomonas (Gram Negative) Folliculitis (Whirlpool/Hot-Tub-Dermatitis) 5

1.1.4 Perianal Streptococcal Dermatitis. 5

1.1.5 Differential Diagnosis: Acne Papulopustulosa 6

1.1.6 Differential Diagnosis: Pseudofolliculitis Barbae  6

1.1.7 Ecthyma Gangrenosum  6

1.1.8 Abscess. 7

1.1.9 Furuncle 7

1.1.10 Carbuncle 7

1.1.11 Erysipelas (Cellulitis). 8

1.1.12 Phlegmon 8

1.1.13 Necrotising Fasciitis (Streptococcal Gangrene) *. 8

1.1.14 Hidradenitis Suppurativa (Acne Inversa) 9

1.2 Other Bacterial Infections: Corynebacteria. 9

1.2.1 Erythrasma 9

1.2.2 Pitted Keratolysis (Keratoma Sulcatum)  9

1.2.3 Trichobacteriosis (Trichomycosis) Palmellina 9

1.2.4 Erysipeloid 10

1.2.5 Anthrax. 10

1.2.6 Nocardiosis**. 11

1.2.7 Rhinoscleroma 11

1.3 Rochalimaea/Bartonellae. 11

1.3.1 Bacillary Angiomatosis and Cat Scratch Disease. 12

1.3.2 Verruga Peruana 12

1.3.3 Differential Diagnosis: Botryomycosis (Granuloma Pyogenicum; Lobular Capillary Hemangioma) 13

1.4 Mycobacterial Infections 13

1.4.1 Tuberculosis Cutis 13

1.4.1.1 Primary Tuberculosis of the Skin 14

1.4.1.2 BCG Vaccination Granuloma 14

1.4.1.3 Differential Diagnosis: Lupus Miliaris Disseminatus Faciei (LMDF) 14

1.4.1.4 Lupus vulgaris (LV) 15

1.4.1.5 Variant: Tuberculosis (Lupus) Cutis Verrucosa 15

1.4.1.6 Variant: Tuberculosis Cutis Colliquativa (Scrofuloderma). 15

1.4.1.7 Lichen Scrofulosorum (Tuberculosis Cutis Lichenoides). 16

1.4.1.8 Papulonecrotic Tuberculid 16

1.4.1.9 Erythema Induratum Bazin (EIB). 17

1.4.2 Atypical Mycobacteriosis: Fish Tank (Swimming Pool) Granuloma. 17

1.4.3 Leprosy (Hansen Disease) 18

1.4.3.1 Tuberculoid Leprosy. 18

1.4.3.2 Borderline Leprosy 19

1.4.3.3 Lepromatous Leprosy 19

1.4.3.4 Variant: Histoid Leprosy (HL). 19

1.4.3.5 Variant: Erythema nodosum leprosum (ENL) 20

1.4.4 Buruli Ulcer 20

1.5 Actinomycosis. 21

1.6 Borrelia Infections (Lyme Disease) 21

1.6.1 Variant: Erythema (Chronicum) Migrans (ECM) (Stage I) 22

1.6.2 Variant: Lymphadenosis Cutis Benigna (Pseudolymphoma, Lymphocytoma Cutis) (Stage I) 22

1.6.3 Variant: Morphea/Scleroderma-Like Lesions (Stage II)  24

1.6.4 Variant: Acrodermatitis Chronica Atrophicans (Stage III). 24

1.6.5 Variant: Juxtaarticular Fibrous Nodules in Acrodermatitis Chronica Atrophicans (Stage III). 25

1.6.6 Differential Diagnosis: Actinic Reticuloid* 25

1.7 Venereal Diseases 26

1.7.1 Gonorrhoea. 26

1.7.2 Syphilis, Chancre 26

1.7.2.1 Stage I. 26

1.7.2.2 Stage II 27

1.7.2.3 Stage III*  27

1.7.3 Ulcus Molle (Chancroid) 28

1.7.4 Granuloma inguinale (Donovanosis; Granuloma venereum)  28

1.7.5 Lymphogranuloma inguinale (lymphogranuloma venereum; Duran-Nicolas-Favre disease)  28

1.8 Rickettsial Infections. 29

1.9 Dermatoses Associated with Bacterial Infections 29

1.9.1 Staphylococcal Scalded Skin Syndrome (SSSS) 29

1.9.2 Differential Diagnosis: Toxic Epidermal Necrolysis (TEN)  30

1.10 Dermatoses Mimicking Bacterial Infections  30

1.10.1 Pyoderma Gangrenosum (PG) 30

1.10.2 Infantile Acropustulosis 31

1.10.3 Acute Generalized Exanthematous Pustulosis (AGEP) 31

1.10.4 Psoriasis Pustulosa 32

1.10.5 Localized Neutrophilic Eccrine Hidradenitis Associated with Mitoxantrone Treatment 32

1.10.6 Erosive Pustular Dermatitis (Pustular Ulcerative Dermatosis) of the Scalp. 33

2 Fungal Infections 33

2.1 Superficial Cutaneous Fungal Infections. 33

2.1.1 Variants: Tinea Corporis; Tinea Faciei. 34

2.1.2 Variants: Tinea Barbae; Tinea Capitis (Trichophytia) 34

2.1.3 Granuloma Trichophyticum (Majocchi’s Granuloma) 35

2.1.4 Candidiasis (Moniliasis). 35

2.1.5 Candida Tropicalis and Candida Lipolytica 36

2.1.6 Pityriasis (Tinea) Versicolor. 36

2.1.7 Variant: Malassezia (Pityrosporum) Folliculitis. 36

2.1.8 Differential Diagnosis: Seborrheic dermatitis  37

2.1.9 Tinea Nigra. 37

2.1.10 Piedra (Trichmycosis nodosa alba and nigra)*. 37

2.2 Subcutaneous Mycoses. 37

2.2.1 Sporotrichosis. 37

2.2.2 Mycetoma (Madura Foot). 38

2.2.3 Chromo(blasto)mycosis (Dermatitis Verrucosa) 38

2.3 Systemic Mycoses (Deep Fungal Infections) 39

2.3.1 Cryptococcosis (Torulosis, European Blastomycosis) 39

2.3.2 North American Blastomycosis (Blastomycosis, Chicago Disease). 40

2.3.3 Lobomycosis (Lobo Disease, Keloidal Blastomycosis, Blastomycoid Granuloma). 41

2.3.4 Histoplasmosis 41

2.3.5 Coccidioidomycosis (Desert or Valley Fever, San Joaquin Fever)  41

2.3.6 Paracoccidioidomycosis (South American Blastomycosis) 42

2.3.7 Emmonsiosis  42

2.4 Opportunistic Fungal Infections  43

2.4.1 Aspergillosis (Alternaria) 43

2.4.2 Zygomycosis (Mucormycosis; Phycomycosis)  43

2.4.3 Hyalohyphomycoses. 44

2.4.4 Phaeohyphomycosis. 44

2.4.5 Protothecosis, Cutaneous 45

3 Viral Infections. 45

3.1 Herpes Viruses. 45

3.1.1 Herpes simplex (HSV-1, HSV-2). 45

3.1.2 Varizella/Zoster Virus Infection (VZV/HHV 3). 46

3.1.2.1 Varicella (Chickenpox). 46

3.1.2.2 Herpes Zoster (Shingles)  47

3.1.2.3 Special Feature: Necrotizing (Herpes) Zoster Folliculitis. 47

3.1.2.4 Special Feature: Zoster Associated Vasculitis 47

3.1.2.5 Postherpetic cutaneous reactions*  48

3.1.3 Burkitt Lymphoma; Epstein-Barr virus (HHV 4; Epstein-Barr Virus; EBV). 48

3.1.4 Hairy Leukoplakia (HHV 4; Epstein-Barr Virus; EBV). 49

3.1.5 Cytomegaly Virus (CMV; HHV 5)  49

3.1.6 Exanthema Subitum (HHV6) (Roseola Infantum, 6th Disease)  49

3.1.7 Pityriasis Rosea (HHV7)  50

3.1.8 AIDS-Kaposi Sarcoma (HHV8). 50

3.1.9 Multicentric Castleman’s Disease (HHV 8). 52

3.2 Human Papilloma Virus (HPV) Infections. 52

3.2.1 Verruca Vulgaris  53

3.2.2 Variant: Verrucae Planae 53

3.2.3 Variant: Condylomata acuminata 54

3.2.4 Differential Diagnosis: Acrokeratosis Verruciformis (Hopf) 54

3.2.5 Bowenoid Papulosis 54

3.2.6 Epidermodysplasia Verruciformis (Lewandowsky-Lutz); Verrucosis Generalisata. 54

3.3 Viral Exanthema. 55

3.3.1 Measles. 55

3.4 Parvovirus and Coxsackievirus Infections. 56

3.4.1 Erythema Infectiosum; (Slapped Cheek Disease; 5th Disease) 56

3.4.2 Papular Purpuric Gloves-and-Socks Syndrome 56

3.4.3 Hand-Foot-and-Mouth Disease (Coxsackie Virus)  56

3.5 Polyoma Virus Infections. 57

3.5.1-1 Trichodysplasia spinulosa 57

3.5.2 Merkel Cell Carcinoma (Primary Neuroendocrine Carcinoma of the Skin; Trabecular Carcinoma of Toker) 58

3.6 Poxviruses 59

3.6.1 Orthopox Virus Infections. 59

3.6.1.1 Cowpox (Catpox)  60

3.6.1.2 Vaccinia Inoculata 60

3.6.1.3 Smallpox (Variola Vera) 60

3.6.2 Parapox Virus Infections. 60

3.6.2.1 Ecthyma Contagiosum (Orf) 60

3.6.2.2 Variant: Milker’s Nodule. 61

3.6.2.3 Molluscum Contagiosum. 61

3.7 Other Skin Diseases with Suspected Viral Association  62

3.7.1 Asymmetric Periflexural Exanthema of Childhood 62

3.7.2 Eruptive Pseudoangiomatosis. 62

3.7.3 Gianotti-Crosti Syndrome. 63

3.7.4 Pityriasis Lichenoides (PL)  63

4 Parasitoses 64

4.1 Protozoan Diseases 64

4.1.1 Leishmaniasis. 64

4.1.2 Variant: Leishmania Mexicana. 65

4.1.3 Amebiasis: Entamoeba Histolytica. 66

4.1.4 Rhinosporidiosis. 66

4.2 Arthropod: Arachnids  66

4.2.1 Mites. 66

4.2.1.1 Demodex Folliculorum. 67

4.2.1.2 Scabies 67

4.2.1.3 Variant: Scabies Crustosa 68

4.2.1.4 Trombidiosis (Harvest mites; Chigger Itch) 68

4.2.2 Spiders* 68

4.2.3 Ticks*. 68

4.2.4 Insects. 69

4.2.5 Tungiasis (Sand Flea)  69

5 Helminthic Infections (Parasitic Worms). 69

5.1 Larva Migrans (Plumber’s Itch; Creeping Eruption). 70

5.2 Filariasis 70

5.3 Onchocerciasis (River Blindness) 70

5.4 Cysticercosis 71

5.5 Sparganosis 71

5.6 Schistosomiasis (Bilharziasis). 72

5.7 Cercarial Dermatitis (Swimmers Itch). 72

5.8 Annelida (ringed worms; segmented worms) *. 72

5.9 Hirudinea (Leeches)  73

6 Sepsis 73

6.1 Septic Vasculitis. 73

6.2. Bacterial Sepsis. 74

6.2.1 Gonococcal Sepsis 74

6.3 Fungal Sepsis. 74

6.3.1 Variant: Penicillium Marinum Sepsis. 74

6.3.2 Variant: Candida Sepsis 74

6.3.3 Variant: Aspergillus Sepsis  74

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• Emphasizes a straightforward pattern-based approach to dermatologic diagnosis
• Matches clinical presentation of disorder with the histopathologic investigations to give the full diagnostic picture
• Contains over 250 outstanding images to aid accurate diagnosis with annotations
• Concise, bite-sized text explains diagnostic pointers
• Written by world renowned authors 

This book is an ideal resource for preparing for the Board examinations, and to guide clinicians and general pathologists in basic dermatopathology practice.