Vascular lesions

The biological classification of vascular lesions into two major categories as tumors and malformations [19] forms a framework for conceiving them in a coherent manner, although evidence for their association has been reported in a small minority [9]. Among them, the lesions that simulate pigmented skin tumors, especially the melanoma, are discussed in this chapter. Some of these fall into the category of tumors (hemangioma, pyogenic granuloma) and some into malformations (angiokeratoma). In addition, subcorneal and subungual hemorrhage is included here for diagnostic purposes. © 2007 Springer-Verlag