Diagnosing the Less Common Skin Tumors Clinical Appearance and Dermoscopy Correlation

Caterina Longo, MD, PhDAssociate Professor, Dermatology and Venereology, at Università degli Studi di Modena e Reggio Emilia (UNIMO); Azienda Unità Sanitaria Locale – IRCCS di Reggio Emilia, Centro Oncologico ad Alta Tecnologia Diagnostica, Modena, Italy; President of AIDNID; Executive Board Member of the International Dermoscopy Society Many texts deal with how to diagnose the straightforward melanomas of the skin, but there are many less common skin tumors that a clinician needs to be aware of because these are still likely to be encountered at some point in a clinical setting and many of them have serious implications. This highly illustrated text from an internationally acclaimed researcher provides a reliable guide to how to proceed with diagnosis of these more challenging entities. Contents: Tumors of the Epidermis: Nevoid basal cell carcinoma syndrome * Fibroepithelioma of Pinkus * Basosquamous carcinoma * Verrucous carcinoma * Sarcomatoid squamous cell carcinoma * Lentigines, Nevi, and Melanoma: Atypical Spitz nevus (tumor) * Halo Spitz nevus * Desmoplastic nevus * Pigmented epithelioid melanocytoma * Animal-type melanoma * Nevoid melanoma * Balloon cell melanoma * Desmoplastic melanoma * Special site melanoma (mucosal, acral) * Tumors of Cutaneous Appendages: Trichoadenoma * Trichoepithelioma and Brooke-Spiegler syndrome * Desmoplastic trichoepithelioma * Trichoblastoma * Tumors of the follicular infundibulum * Tricholemmoma and tricholemmal carcinoma and Cowden syndrome * Pilomatrixoma * Fibrofolliculoma/trichodiscoma and Birt—Hogg-Dubè syndrome * Sebaceous tumors *Syringocystadenoma papilliferum * Hidradenoma * Cylindroma and familial cylindromatosis and Brooke-Spiegler syndrome * Spiradenoma * Mammary and extramammary Paget’s disease * Syringoma * Eccrine poroma and eccrine porocarcinoma * Mesenchymal Tumors: Dermatofibrosarcoma protuberans * Atypical fibroxanthoma * Malignant fibrous histiocytoma (pleomorphic undifferentiated sarcoma) * Other Uncommon Tumors: Merkel cell carcinoma * Kaposi’s sarcoma * Angiosarcoma * Retiform hemangioendothelioma With contributions from: Alessandro Annetta * Giuseppe Argenziano * Elisa Benati * Caterina Bombonato * Stefania Borsari * Eugenia Veronica Di Brizzi * , Gerardo Ferrara * Giorgio La Viola * Mara Lombardi * Elvira Moscarella * Riccardo Pampena * Giovanni Paolino * Simonetta Piana

Contributors SECTION I. TUMORS OF THE EPIDERMIS 1. Nevoid basal cell carcinoma syndrome 2. Fibroepithelioma of Pinkus 3. Basosquamous carcinoma 4. Verrucous carcinoma 5. Sarcomatoid squamous cell carcinoma SECTION II. LENTIGINES, NEVI, AND MELANOMA 6. Atypical Spitz nevus (tumor) 7. Halo Spitz nevus 8. Desmoplastic nevus 9. Pigmented epithelioid melanocytoma 10. Animal-type melanoma 11. Nevoid melanoma 12. Balloon cell melanoma 13. Desmoplastic melanoma 14. Special site melanoma (mucosal, acral) SECTION III. TUMORS OF CUTANEOUS APPENDAGES 15. Trichoadenoma 16. Trichoepithelioma 17. Desmoplastic trichoepithelioma 18. Trichoblastoma 19. Tumors of the follicular infundibulum 20. Tricholemmoma and tricholemmal carcinoma and Cowden syndrome 21. Pilomatrixoma 22. Fibrofolliculoma/trichodiscoma and Birt-Hogg-Dubè syndrome 23. Sebaceous tumors 24. Syringocystadenoma papilliferum 25. Hidradenoma 26. Cylindroma and familiar cylindromatosis and Brooke-Spiegler syndrome 27. Spiradenoma 28. Mammary and extramammary Paget’s disease 29. Syringoma 30. Eccrine poroma and eccrine porocarcinoma SECTION IV. MESENCHYMAL TUMORS 31. Dermatofibrosarcoma protuberans 32. Atypical fibroxanthoma 33. Malignant fibrous histiocytoma (pleomorphic undifferentiated sarcoma) SECTION V. OTHER UNCOMMON TUMORS 34. Merkel cell carcinoma 35. Kaposi’s sarcoma 36. Angiosarcoma 37. Retiform hemangioendothelioma

Caterina Longo is a dermatologist specializing in the diagnosis and treatment of skin cancers by noninvasive modalities such as dermoscopy and confocal microscopy. She works as scientific consultant at the skin cancer unit of ASMN-IRCCS Reggio Emilia, Italy. She won the IDS prize in 2015 as best young researcher.