Rhabdoid Melanoma
Fig. 49.1 Sheets of atypical melanocytes with abundant eosinophilic cytoplasm comprise rhabdoid melanoma Fig. 49.2 The tumor cells have marked nuclear atypia and abundant densely eosinophilic cytoplasm. The appearance is…
Diffuse Large B-cell Lymphoma: Leg Type
Fig. 68.1 DLBL-LT: Solitary nodule on the lower leg Pathology A dense diffuse dermal infiltrate of centroblast- and immunoblast-like cells with non-cleaved, i.e., round nuclei and mitotic activity, is found…
Microcystic Adnexal Carcinoma
Fig. 22.1 A slowly enlarging, flesh-colored, indurated plaque with ill-defined borders on the face Pathology At scanning magnification, MAC has a silhouette of a malignant neoplasm, being large, asymmetrical, and…
Primary Cutaneous Ewing Sarcoma/Primitive Neuroectodermal Tumor
Fig. 57.1 Primary cutaneous ES/PNET displays a nodular dermal-based proliferation of small round blue cells (Image courtesy of Steven D. Billings, MD) Fig. 57.2 ES/PNET is composed of hypercellular sheets…
Subcutaneous Panniculitis-Like T-Cell Lymphoma
Fig. 64.1 SPTCL: Infiltrated deep-seated skin lesions on the neck with ulceration (Courtesy of Prof. Dr. G. Burg, Zürich) Pathology SPTCL is characterized by lobular infiltrates composed of small- to…
Rare Variants of Mycosis Fungoides: Syringotropic Mycosis Fungoides
Fig. 62.1 Syringotropic mycosis fungoides. Erythematous, scaly patch with papules on the flank Fig. 62.2 Syringotropic mycosis fungoides. An alopecic patch with anhidrosis Pathology SMF is characterized by a dense…
Rare Variants of Mycosis Fungoides: Localized Pagetoid Reticulosis (Woringer-Kolopp Type)
Fig. 61.1 Localized pagetoid reticulosis. A solitary, slowly enlarging, persistent erythematous patch with sharply demarcated borders for 10 years Pathology Histologically, LPR demonstrates a hyperplastic epidermis with striking colonization by…
Pseudomyogenic Hemangioendothelioma
Fig. 39.1 Clinical photo of two adjacent foci of PH from the leg of a young male Pathology PH is characterized by an infiltrative proliferation of spindle cells arranged in…
Syringoid Eccrine Carcinoma
Fig. 23.1 Syringoid eccrine carcinoma. An indurated withish plaque on the cheek Fig. 23.2 Syringoid eccrine carcinoma. An infiltrated plaque with ill-defined margins on the wrist Pathology The histological appearance…
Clear Cell and Signet-Ring Cell Squamous Cell Carcinoma
Fig. 2.1 An ulcerated vegetating tumor on the cheek of an 83-year-old woman Pathology Originally, Kuo described three types of clear cell SCC, namely, keratinizing (type I), nonkeratinizing (type II),…
