China
Africa
Explore chapters and articles related to this topic
Nonmelanocytic Lesions
Published in Ashfaq A Marghoob, Ralph Braun, Natalia Jaimes, Atlas of Dermoscopy, 2023
Constanza Riquelme-Mc Loughlin, Daniel Morgado-Carrasco, Susana Puig, Cristina Carrera
Sebaceous neoplasms are adnexal tumors with sebaceous differentiation that comprise a broad spectrum of histopathologic subtypes [14]. Consistent criteria for the diagnosis and nomenclature of sebaceous tumors are lacking. However, these tumors have conventionally been classified from the benign to malignant spectrum as benign sebaceous hyperplasia, sebaceous adenoma, sebaceoma, and sebaceous carcinoma [8]. Dermoscopic characteristics of these tumors are described in Table 6g.2.
Benign adnexal lesions
Published in Iris Zalaudek, Giuseppe Argenziano, Jason Giacomel, Dermatoscopy of Non-Pigmented Skin Tumors, 2016
Although there is certain controversy, benign sebaceous lesions are basically classified into sebaceous nevus, sebaceous hyperplasia, sebaceous adenoma, and sebaceoma. Two main dermoscopic structures are associated with sebaceous lesions: aggregated white-yellowish globules or areas (which correspond to dermal conglomerations of sebaceous glands) and vascular structures.1–6 In sebaceous nevus, we usually observe whitish-yellow or yellowish-brown areas or globules without remarkable vascular structures (Figure 24.1).1 The most common pattern associated with sebaceous hyperplasia is the presence of aggregated whitish-yellow globules in the center of the lesion with a surrounding crown of vessels (Figure 24.2).1–4 These “crown vessels” have been defined as groups of orderly, bending, scarcely branching vessels located along the border of the lesion. Sometimes, the ostium of the gland is visible as a small crater or umbilication in the center of these yellowish structures. In sebaceous adenoma and sebaceoma, we can observe larger whitish-yellow globules or whitish-yellow structureless ovoid areas, sometimes with a central crater or covered by crusts, and radial elongated telangiectasias or unfocused arborizing telangiectasias (Figure 24.3).5,6
Tumors of Cutaneous Appendages
Published in Omar P. Sangueza, Sara Moradi Tuchayi, Parisa Mansoori, Saleha A. Aldawsari, Amir Al-Dabagh, Amany A. Fathaddin, Steven R. Feldman, Dermatopathology Primer of Cutaneous Tumors, 2015
Sebaceoma: More than 50% of cells are small germinative basaloid cells
Multiple secondary neoplasms in nevus sebaceus excision
Published in Baylor University Medical Center Proceedings, 2022
Travis S. Dowdle, David A. Mehegran, Dylan Maldonado, Cort D. McCaughey
Nevus sebaceus is of particular clinical interest because of its association with the development of secondary neoplasms of varying rarity. Secondary tumors are typically benign, but malignant neoplasms have also been observed. The most common benign neoplasms include trichoblastoma and syringocystadenoma papilliferum. Additional benign neoplasms such as apocrine/eccrine adenoma, trichilemmoma, and sebaceoma have been observed.3 It has been estimated that approximately 40% of syringocystadenoma papilliferum lesions are associated with nevus sebaceus.4