Christine J. Ko, MD, is Professor of Dermatology and Pathology at Yale University. She is board certified in both dermatology and dermatopathology. She is the author of several academic texts in dermatology and dermatopathology, including Dermatology Essentials and Dermatology: Visual Recognition and Case??Reviews.Ronald J. Barr, MD, is Professor Emeritus of Dermatology and Pathology at University of California, Irvine. He??is board certified in anatomical pathology, dermatology, and dermatopathology. He is recognized for his many contributions in dermatopathology, involving both neoplastic and non-neoplastic disorders.

• Preface, viiiAcknowledgments, ixAbout the Companion Website, xiIntroduction, 1Chapter 1 Shape on Low Power, 23EpidermisRegular acanthosis, 25Lobular proliferation, 29Reticulated proliferation, 35Central pore, 42Epidermal perforation, 46DermisCircular islands, 49Cords/tubules and comma shapes, 53Space with a lining, 59Papillations, 70Polypoid (dome-shaped), 77Square/rectangular, 82Palisading reactions, 88Pseudoepitheliomatous hyperplasia above abscesses, 95Pink ball, (see Chapter 6)Chapter 2 Gestalt: Rash/inflammatory, 99Epidermal changesParakeratosis, 101Spongiosis, 104Papulosquamous (psoriasiform), 108Interface (vacuolar), 114Interface (lichenoid), 119Inflammation: Specific patterns and cell typeEpidermal eosinophils, 125Perivascular, 129Band-like dermal/papillary dermal infiltrate, 133Diffuse/nodular, 139Subcutaneous, 146Chapter 3 Cell Type, 153Melanocytic, 155Spindle cells, 168Pleomorphic cells, 186Epithelioid vs spindle vs pleomorphic cells, 187Endothelial, 188Giant, 202Clear, 212Chapter 4 Top-Down, 229Arthropods, 231Hyperkeratosis/parakeratosis, 237Upper epidermal change, 244Acantholysis, 254Subepidermal space/cleft, 264Granular “material” in cells, 271“Busy” dermis, 276Dermal material, 279Fat necrosis, 292Chapter 5 Color – Blue, 295Blue tumor, 297Lymphocytes, 307Mucin and glands or ducts, 315Mucin, 319Chapter 6 Color – Pink, 327Pink ball of spindle cells, 329Pink material, 332Pink dermis, 339Epidermal necrosis, 341Chapter 7 Miscellaneous, 347Alopecia, 349Immunohistochemistry, 354Index (Pattern), 361Index (Histological Category), 366Index (Alphabetical), 369

Christine J. Ko, MD, is Professor of Dermatology and Pathology at Yale University. She is board certified in both dermatology and dermatopathology. She is the author of several academic texts in dermatology and dermatopathology, including Dermatology Essentials and Dermatology: Visual Recognition and Case??Reviews.Ronald J. Barr, MD, is Professor Emeritus of Dermatology and Pathology at University of California, Irvine. He??is board certified in anatomical pathology, dermatology, and dermatopathology. He is recognized for his many contributions in dermatopathology, involving both neoplastic and non-neoplastic disorders.

• Preface, viiiAcknowledgments, ixAbout the Companion Website, xiIntroduction, 1Chapter 1 Shape on Low Power, 23EpidermisRegular acanthosis, 25Lobular proliferation, 29Reticulated proliferation, 35Central pore, 42Epidermal perforation, 46DermisCircular islands, 49Cords/tubules and comma shapes, 53Space with a lining, 59Papillations, 70Polypoid (dome-shaped), 77Square/rectangular, 82Palisading reactions, 88Pseudoepitheliomatous hyperplasia above abscesses, 95Pink ball, (see Chapter 6)Chapter 2 Gestalt: Rash/inflammatory, 99Epidermal changesParakeratosis, 101Spongiosis, 104Papulosquamous (psoriasiform), 108Interface (vacuolar), 114Interface (lichenoid), 119Inflammation: Specific patterns and cell typeEpidermal eosinophils, 125Perivascular, 129Band-like dermal/papillary dermal infiltrate, 133Diffuse/nodular, 139Subcutaneous, 146Chapter 3 Cell Type, 153Melanocytic, 155Spindle cells, 168Pleomorphic cells, 186Epithelioid vs spindle vs pleomorphic cells, 187Endothelial, 188Giant, 202Clear, 212Chapter 4 Top-Down, 229Arthropods, 231Hyperkeratosis/parakeratosis, 237Upper epidermal change, 244Acantholysis, 254Subepidermal space/cleft, 264Granular “material” in cells, 271“Busy” dermis, 276Dermal material, 279Fat necrosis, 292Chapter 5 Color – Blue, 295Blue tumor, 297Lymphocytes, 307Mucin and glands or ducts, 315Mucin, 319Chapter 6 Color – Pink, 327Pink ball of spindle cells, 329Pink material, 332Pink dermis, 339Epidermal necrosis, 341Chapter 7 Miscellaneous, 347Alopecia, 349Immunohistochemistry, 354Index (Pattern), 361Index (Histological Category), 366Index (Alphabetical), 369