Foreword v

Preface vii

Contributors ix

Part 1 Hair Follicle Biology

1.1 Ontogeny of the hair follicle Desmond J. Tobin 3

1.2 Anatomy and physiology of the hair follicle Desmond J. Tobin 17

1.3 Hair follicles in domesticated mammals with comparison to laboratory animals and humans Wilfried Meyer 43

Part 2 How to Approach Alopecic Diseases

2.1 Clinical aspects Monika Linek 65

2.2 Histopathological aspects Lars Mecklenburg 77

Part 3 Non-Inflammatory Alopecias

3.1 Congenital alopecia Lars Mecklenburg 93

3.2 Trichomalacia Lars Mecklenburg 115

3.3 Disorders of hair follicle cycling 119

3.3.1 Hypothyroidism Monika Linek 119

3.3.2 Hyperadrenocorticism Rosario Cerundolo 132

3.3.3 Canine hyperestrogenism Lars Mecklenburg 142

3.3.4 Canine alopecia X Linda Frank 148

3.3.5 Canine recurrent flank alopecia Manon Paradis 155

3.3.6 Telogen effluvium Rosario Cerundolo 161

3.3.7 Canine postclipping alopecia Rosario Cerundolo 163

3.3.8 Canine pattern alopecia Manon Paradis 164

3.3.9 Breed-specific canine hair cycle abnormalities Rosario Cerundolo Manon Paradis Lars Mecklenburg 169

3.4 Hair follicle dystrophy and atrophy Rosario Cerundolo Lars Mecklenburg 177

3.5 Traumatic alopecia Monika Linek 185

3.6 Scarring alopecia Lars Mecklenburg 189

Part 4 Inflammatory Alopecias

4.1 Folliculitis with intraluminal organisms Monika Linek 193

4.2 Eosinophilic folliculitis Monika Linek 215

4.3 Pustular folliculitis Monika Welle 221

4.4 Lymphocytic mural folliculitis Monika Welle 227

4.5 Histiocytic or granulomatous mural folliculitis Monika Welle Lars Mecklenburg 243

4.6 Necrotizing mural folliculitis Monika Linek Lars Mecklenburg 249

4.7 Alopecia areataDesmond J. Tobin 253

4.8 Sebaceous adenitis Monika Linek 269

Index 273