Fig. 50.1 Balloon cell melanoma. Enlarged polygonal cells with vacuolated (clear) cytoplasm and central hyperchromatic nucleus in at least 50 % of cells Fig. 50.2 Balloon cell melanoma. Nuclear pleomorphism,…

Fig. 36.1 Epithelioid hemangioendothelioma. A single, erythematous, painful nodular plaque on the trunk. Although a vascular lesion can be considered, the diagnosis is a histological one Pathology The tumor is…

Fig. 48.1 Myxoid melanoma. Melanocytes are embedded in a myxoid stroma, composed of basophilic, acidic mucin, that may be either focal or diffuse Fig. 48.2 Myxoid melanoma. Spindle, round, stellate-shaped,…

Fig. 37.1 Kaposiform hemangioendothelioma. Irregular tumor nodules growing in an infiltrative fashion and evoking a dense hyaline stromal response (Courtesy of H.Kutzner, Friedrichshafen) Fig. 37.2 Kaposiform hemangioendothelioma. Tumor nodules composed…

Fig. 47.1 Signet ring cell melanoma. Low-power magnification demonstrates an intraepidermal proliferation of atypical melanocytes with pagetoid spread. Within the dermis, there are sheets of atypical melanocytes, some of which…

Fig. 20.1 Malignant cylindroma. The tumor is composed of dermal irregular cords and nests with an infiltrative pattern of growth, without connection to the epidermis Fig. 20.2 The tumor forms…

Fig. 5.1 Mucoepidermoid carcinoma. An ulcerated nodule on the forehead of an old patient Pathology MEC is usually a dermal-based nodular, nonencapsulated solid, and/or cystic neoplasm without continuity with the…

Fig. 15.1 This 63-year-old man presented with a slow-growing indurated nodule in association with a long-standing ill-defined erosive erythematous plaque in the perianal region Pathology Primary cutaneous apocrine adenocarcinoma is…

Fig. 8.1 The tumor presents as a slowly growing, fleshy, sessile, or pedunculated lesion Pathology The tumor is characterized by a fenestrated pattern formed by thin anastomosing strands of basaloid…

Fig. 31.1 Fibrosarcoma. The tumor is composed of monomorphic elongated, spindle cells that grow in interlacing fascicles, forming a so-called herringbone pattern Fig. 31.2 Fibrosarcoma. Herringbone pattern Fig. 31.3 Fibrosarcoma….