Index. Springer-Verlag Berlin Heidelberg 2017 J.A. Plaza, V.G. Prieto, Pathology of Pigmented Skin Lesions, DOI /

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1 A Acral lentiginous (mucosal lentiginous) melanoma, 483 Acral lentiginous melanoma (ALM) asymmetric and irregular lentiginous junctional growth, 431 clinical features, differential diagnosis, discohesive nests, 430 genetics, histopathology, 428 invasive, 432, 434 irregularly distributed single-cell melanocytes, 430 recurrent, 436 Acral melanocytic nevi vs. acral melanoma, 182 characteristic features, 181 differential diagnosis, histologic features, 181, 182 lentiginous pattern of growth, 186 lesion, 183 MANIAC, 187 Acral skin, 428 Actinic lentigo clinical features, 3 differential diagnosis, 5 8 histopathology, 3 5 Agminated blue nevi, 25 American Joint Committee on Cancer (AJCC), 361, 362 Ancient melanocytic nevi, Angiomatoid spitz nevus clinical features, 250 differential diagnosis, 250 histologic features, 250 location, 251 vs. regressing melanoma, 250 Animal-type melanoma (pigment synthesizing melanoma), 45 Atypical cellular blue nevus (ACBN) CGH, 78 clinical features, 77 differential diagnosis, 77 histopathology, 77 hypercellular areas reminiscent, 80 immunohistochemistry and molecular testing, 77 Atypical pigmented spindle cell nevus, 241 Atypical Spitz lesion, 497 6q23 deletion, FISH, 282 histologic features, 280 immunohistochemistry and molecular studies, melanomas, 280 morphologic features, 280 pigmented lesion, 281 RREB1/CCND1, B Balloon cell nevus, 109, 126 BAP1. See BRCA1-associated protein 1 (BAP1) Becker nevus, 15, 16 clinical features, 15 differential diagnosis, histopathology, 15 Benign lichenoid keratosis, 4 B-K mole syndrome, 291 Blue nevus amelanotic, 30, 39, 40 cellular atypia, 31 clinical features, combined, 30, 32, 33, 35, 36 compound, 30, 38 desmoplastic (sclerosing), 31 differential diagnosis, 26 histopathology, 26 immunohistochemistry and molecular findings, sclerotic, 42 sclerotic amelanotic, 44 Blue nevus-like melanoma (BNLM), 46, 55, 512 biphasic neoplasm, 84 clinical features, 82 differential diagnosis, 83 histopathology, immunohistochemistry and molecular testing, 83 BRCA1-associated protein 1 (BAP1), 269, 270, 272 C Café au lait macules (CALM) clinical features, 17 differential diagnosis, histopathology, 17 Café au lait spots, 327 Capillary hemangioma, 327 Carney complex, 3, 45, 46 Cellular blue nevi (CBN) amelanotic, 70, 71, 73 aneurysmal, 69 balloon cell changes, 64 clinical features, 54 differential diagnosis, 55 dumbbell architecture, 56 epithelioid melanocytes, 62 follicular structures, 60 histopathology, immunohistochemistry and molecular testing, 55 marked stromal hemorrhage, 67 multinucleated wreath-like giant cells, 64 Springer-Verlag Berlin Heidelberg 2017 J.A. Plaza, V.G. Prieto, Pathology of Pigmented Skin Lesions, DOI /

2 522 Cellular blue nevi (CBN) (cont.) myxoid and cystic degeneration, 66 plaque-type, 70 71, 75 Cellular blue nevus-like melanocytic tumor, 77 Cockarde nevus, 108 Combined melanocytic nevi blue and common intradermal nevus, 137, 138 intradermal and Spitz, 141 Spitz and blue nevus, 138, 143 Spitz and common nevus, 138 Common acquired melanocytic nevi clinical features, 99 compound nevi, 100, 103, 104 congenital features, 111 differential diagnosis, intradermal nevi, junctional nevi, 100, 102 melanoma, 99 types, 99 Comparative genomic hybridization (CGH), 77, 429, 512 Compound melanocytic nevi, 100 Compound mild dysplastic nevus, 302 Compound Spitz nevus dermal component, 208 histologic feature, 208 Kamino bodies, 207 lymphatic invasion/perineural invasion, 208 melanocytes, 207 pagetoid spread, 207 pigmented lesion, 209 polypoid and melanocytes, 212 wedge-shaped growth, 214 Congenital blue nevus, 331 Congenital melanocytic nevi clinical features classification, 328 congenital melanocytic nevi, 328 dark brown macules or papules, 328 lesions, 328 mouth and nails, 328 peculiar tendency, 328 small and medium congenital nevi, 328 developmental abnormalities, 327 differential diagnosis, dysplastic features, 332 etiology and pathogenesis, histopathologic features, intradermal congenital nevus, 345 lesions, 327 melanocytes, 340 melanoma, neurocutaneous melanosis, 327 proliferation, 327, 343 reticular dermis, 335 subcutaneous adipose tissue, 341 Congenital Spitz nevus, Conventional blue nevus, 27, 29 Cronkhite-Canada syndrome, 3 Cutaneous neurocristic hamartoma (CNH) clinical features, 94 histopathology, 94 immunohistochemistry and molecular testing, 94 D Deep penetrating nevus (DPN), 46 atypical histologic features, 86 chronic inflammatory response, 93 clinical features, 86 differential diagnosis, 87 eccrine and erector pili muscle, 92 histopathology, 86 immunohistochemistry and molecular testing, 87 inverted wedge-shaped architecture, 87, 88 mild lentiginous hyperplasia and uniform nests, melanocytes, 90 reticular dermis, 90 Dendritic melanocytes, 26 Dermal melanocytoses. See also Blue nevus Mongolian spot, nevus of Ota and Ito, 21 nevus of Sun and nevus of Hori, 25 Dermal melanoma, 108, 109 Desmoplastic melanoma (DM), 31 asymmetric dermal lesion, 463 clinical features, 457 dermatofibrosarcoma protuberans, 470 diagnostic dermatopathology, 460 differential diagnosis, histopathologic features, immunohistochemistry, 458 neurofibroma and nevoid component, obvious intraepidermal component, 468 spindle cell melanoma, 457 spindle cells, 466 Desmoplastic Spitz nevus clinical features, 245 differential diagnosis, 246 histologic features, symmetric dermal proliferation, 247 wedge-shaped architecture, 249 Duke University grading system, 295 Dysplastic (atypical) lentiginous nevus, 295, 296 Dysplastic melanocytic nevi, 293, 294 architectural disorder, 291 CDKN2A, 291, 292 clinical features, definition, 291 dermatopathology, 291 etiology, 292 familial melanoma, 292 histologic evaluation, 291 histologic features, 295 architecture, 293, 294 cytology, 294 host response, 294 melanoma-prone families, 291 phenotype, 291 precursor of melanoma, risk factor, skin types, 292 Dysplastic nevi cryotherapy, 322 early melanoma, 320 vs. melanoma, 297 regression, 319 Dysplastic nevus syndrome (DNS), 293, 360 Dysplastic Spitz nevi clinical features, 241 differential diagnosis, 241 flat and symmetric growth, 244 histologic features, 241 E Ectopic melanocytes, 99 Ephelides, 1, 2

3 Epidermotropic metastatic melanoma (EMM), 493 Epithelioid blue nevus clinical features, 45 differential diagnosis, 46 histopathology, immunohistochemistry and molecular testing, 46 Eyeliner sign, 380 F Fascicular schwannoma, 327 Fluorescence in situ hybridization (FISH), 31, 459 advantages, 513 ambiguous melanocytic tumors, 513, 514 CGH data, 513 dermatopathology, 514 diagnosis, 513 DNA fragments, 512 lentiginous nevus, 513 mass spectrometry, 514 melanocytic proliferation, 512 molecular technique, 512 polyploidy/tetraploidy, 514 UCSF, 513 G Genital nevi clinical features, 189 differential diagnosis, 189 histologic features, 189 vs. melanoma, 190 molecular studies, 190 G-protein α subunit (GNAQ), 26 Grading dysplastic nevi, 295 The great mimickers, 493 H Halo nevus characterization, 147 clinical stages, 147 cytologic atypia of melanocytes, 154 differential diagnosis, 148 histologic feature, 147 lymphocytic infiltrate, 147, 150, 152, 153 predominant lymphohistiocytic infiltrate, 157 vs. regressing melanoma, 148 Turner syndrome and vitiligo, 147 Halo reaction clinical features, 256 differential diagnosis, histologic features, 256 lymphocytic infiltrate, 257 HRAS mutations, 87, 246, 275, 276 Hyalinizing spitz nevus epithelioid melanocytes, 253 junctional component, 252 spindle and epithelioid melanocytes, 253 spindle cell melanocytes, 252 Intradermal Spitz nevi epidermal hyperplasia, 217 epithelioid melanocytes, 222 interstitial growth pattern, 220 lesion, 218 melanocytes, 217 pigmented, 224 pigmented epithelioid, 217 sweat duct, 226 Intradermal stages, 200 Intraepidermal lesion, 200, 202, 206 Intraepidermal melanocytic hyperplasia, 15 J Junctional melanocytic nevi, 100 Junctional dysplastic nevus, 298, 300 mild, 298, 300 moderate, 304, 306 severe, 312, 314, 317 Junctional Spitz nevi, 200, 206, 207 L Large cell acanthoma, 9 clinical presentation, 9 histopathology, 9 10 solar lentigo and actinic keratosis, 9 Lentigines actinic lentigo (pigmented early actinic keratosis, solar lentigo), 3 8 becker nevus, CALM, ephelides, 1 ink-spot lentigo, 8 9 large cell acanthoma, 9 10 lentigo simplex, 1 3 melanotic macules, PUVA lentigo, Lentiginous melanoma, 297, 490 histopathology, oral mucosa, 484 solar elastosis, 489 Lentigo maligna clinical features, congenital nevus, 377 differential diagnosis, histopathologic features, in situ, 367, 369, 370, 372, 374 intraepidermal melanocytic hyperplasia, 375 Lentigo simplex, 4 clinical features, 1 3 differential diagnosis, 3 histopathology, 3 LEOPARD syndrome, 3 Loss of heterozygosity (LOH), 46 Low-grade melanocytic tumors, 45 Lymphangioma, 327 Lymphocytic inflammatory infiltrate, 208 Lymphovascular invasion, I Immunohistochemistry (IHC), 229, 366 Ink-spot lentigo clinical features, 8 histopathology, 8 9 Intradermal melanocytic nevi, M Matrix-assisted laser desorption/ionization (MALDI), 514 Melanocortin-1 receptor (MC1R), 360 Melanocytic acral nevus with intraepidermal ascent of cells (MANIAC), 181, 187, 429

4 524 Melanocytic nevi, 166, 167, , , 179 nevi of special sites axillary nevus, 179 breast, 169, 172 ear, 169, 170, 174, 175 flexural, 169 scalp, 169, 171 thigh and ankle, 170, 176 in pregnancy, 159, 160 recurrent/persistent congenital and dysplastic nevi, 166 differential diagnosis, 166, 167 dysplastic compound nevus, 167 histologic features, 166 repigmentation, 166 Melanocytic nevi variants adipose tissue, 109 ancient nevi, 108, 119 balloon cell nevi, 109, 126, 127 bone metaplasia, 126 Cockarde nevi, 108 dermal mitotic figures, 110 intradermal nevus, 113 inverted type A nevi, 108 lipomatous metaplasia, 132 Meyerson nevi, 107, 115 Miescher nevi, 107 mitotic figures vs. melanoma, 110 neurotized nevi, 109, 129 pseudovascular spaces, 109 Spilus nevi, 108 traumatized nevus, 136 Unna nevus, 107, 113 Melanocytoma, 512 Melanoma, 351, 354, 359, 360, 497 AJCC melanoma staging and classification system, 361 Breslow thickness, childhood, 498 histopathology, 497 pigmented skin lesion, 497 Spitz nevus, 497 univariate analysis, 497 Clark level, 362 description, 359 histologic subtypes, 361 institutions and dermatopathologists, 361 lymphovascular invasion, 363 microscopic satellitosis, 364 mitotic figures, 362 mortality rates, 359 perineural invasion, radial and vertical growth phase, 362 regression, 363 risk factors CDK4 and p16/cdkn2a, 360 demographic, 359 environmental, 360 family history, 360 nevi/dysplastic nevi, 360 SEER data, 359 subtypes, 364 synoptic report, 361 TILs, 364 ulceration, 363 Melanonychia striata, 10 Melanophages, 309 Melanotic macules, 10, 11 acral, 10 differential diagnosis, genital, 10 histopathology, lip, 12 nail bed, 10 oral/labial, 10 vulva, 13 Metastatic cutaneous melanoma blue nevus-like morphology, 495 epidermotropism, 496 epithelioid cytomorphology, 493 histopathology, nevoid features, 496 spitzoid changes, 494 Meyerson nevi, 107, 115 Microsatellites, 364 Miescher nevus, 107 Mitotic figures vs. melanoma, 110 Mongolian blue spot, Monomorphic melanocytes, 202 Mucosal melanoma, 427 clinical features, dermis, 480 differential diagnosis, histopathology, 483 junctional component, 478 Mucosal nevi, 327 N National Institutes of Health (NIH), 291, 296 Neurofibromatosis type 1 (NF1), 17 Neurofibromatosis-like features, Neurotized nevus, 109 Nevi in pregnancy, Nevoid melanoma (NM) histopathology, immunohistochemistry, 474 intradermal nevus, 476 junctional nevus, 474 litigation, 473 Nevus fuscoceruleus acromiodeltoideus, 21 Nevus fuscoceruleus zygomaticus, 25 Nevus of Hori. See Nevus of Sun Nevus of Ito, 21 Nevus of Ota, 21, 22 Nevus of Sun clinical features, 25 differential diagnosis, 25 histopathology, 25 Nevus with phenotypic heterogeneity, 30 Nodular melanoma clinical features, 438 dermal nevus, 450 dermal regression, 454 dusky cytoplasm, 452 epithelioid and spindle cell melanocytes, 443 histopathology, malignant features, 439 massive hyperpigmentation, 448 pigmentation, 447 pseudovascular spaces, 445 rhabdoid features, 456 ulceration, 441

5 525 O Oculodermal melanocytosis/nevus fuscoceruleus opththalmomaxillaris, 21 P Pagetoid melanocytes, 181, 182, 208, 230, 296 Pagetoid Spitz nevus, Perineural invasion, Peutz-Jeghers syndrome, 3 Phacomatosis pigmentovascularis, 22 Phenotypic heterogeneity, 30 Pigmented epithelioid melanocytomas (PEMs), 47, 48, 50, 51, 53. See also Epithelioid blue nevus Pigmented spindle cell nevus of Reed (PSCN), 230 amelanotic, 239 clinical features, 229 differential diagnosis, 230 early phase, 231, 232 histologic features, 230 intradermal component, 238 junctional, 236 melanocytic nests, 234 Plexiform Spitz nevus, 264 Polypoid Spitz nevus diagnosis, 258 mitotic figures, 258 pedunculated architecture, 258, 259 pseudoepitheliomatous hyperplasia, 261 Polypoid spitzoid melanoma, 502 Primary dermal melanoma (PDM), Proliferative nodules clinical features, 332 congenital nevus, 347 epithelioid melanocytes, histopathologic features, 332 intradermal melanoma, magnification, 349 melanoma, 334 pigmented papules, 332 small round blue cell-like pattern, 333 spitzoid pattern, 333 Protein kinase A regulatory subunit 1 alpha (PRKAR1A), 46 Pseudoepitheliomatous hyperplasia, 207 Pseudomelanoma, 166, 168, 331 Psoralens and ultraviolet-a radiation (PUVA), 14 clinical features, histopathology, Pyogenic granuloma, 199 R Recurrent/persistent Spitz nevus clinical features, 266 dermal scar, 267 histologic features, Regression, 363 S Senile freckle, 364 Sentinel lymph node (SLN), 45 Solar lentigo, 5 intraepidermal melanocytic hyperplasia, 6 junctional nevus ( jentigo ), 7 seborrheic keratosis, 6 SPARKS Melanocytic nevus, Spilus nevi, 108 Spitz nevi, ALK fusions, 277 clinical features, 199 description, 199 differential diagnosis cutaneous metastatic melanoma, 228 cytologic atypia, 228 description, 227 epidermal hyperplasia, 229 epithelioid cells, 228 irregular and infiltrative margins, 228 junctional edges, 228 Kamino bodies, 228 mitotic figures, 228 pagetoid, 229 spitzoid melanoma, 227 stabilization, 228 sun-damaged skin, 228 zonation, 228 histologic features, 199, 200 immunohistochemical/molecular ancillary techniques, 199 immunohistochemistry, 229 intraepidermal, junctional, plexiform, 264 vs. spitzoid melanoma, 229 Spitzoid melanocytic proliferation, 501 Spitzoid melanoma (SM), 506, 508, 510 asymmetry and irregular pigmentation, 501 FISH, 501 histopathology, HMB-45 antigen and Ki-67, 501 tetraploidy, 501 Spitzoid tumor, 501 Superficial spreading melanoma balloon cells, 410, 412 clinical features, 379 dermal regression, 399 differential diagnosis, 380 dysplastic nevus, 420, 422, 424 epidermal hyperplasia, 408 epithelioid melanocytes, 404 epithelioid pigmented and nonpigmented melanocytes, 395 histopathologic features, in situ, 381, 383, 385, 386, 388 invasive, 392 invasive nevoid component, 406 lichenoid tissue reaction, 400, 402 microsatellite nodule, 426 nevus, 397 pseudoepitheliomatous hyperplasia, 394 recurrent, 418 spindle melanocytes, 414, 416 superficial invasion, 390 Surveillance, Epidemiology, and End Results (SEER), 359 T Traumatized melanocytic nevi clinical features, 110 vs. melanoma, 111 trauma, 111

6 526 Tumor infiltrating lymphocytes (TILs), 364 Tumor mitotic rate, 362 V Vulvar melanoma, 485, 487 U Ulcerated Spitzoid melanoma, 510 Ulceration, 363 Unna melanocytic nevi, 107, 113 X Xeroderma pigmentosum, 3