Undifferentiated Pleomorphic Sarcoma (Malignant Fibrous Histiocytoma) Key Points Undifferentiated pleomorphic sarcoma (UPS) describes a soft tissue tumor of primitive mesenchymal origin that involves deep skeletal muscle, fascia, and adipose tissue…

Trichilemmal Carcinoma Key Points Trichilemmal carcinoma (TC) derives from the outer hair root sheath The pathogenesis of TC is not completely understood, but risk factors include UV and ionizing radiation,…

Squamous Cell Carcinoma Key Points Squamous cell carcinoma (SCC) is a malignant tumor of the squamous layer of cells of the epidermis, showing keratinocyte differentiation It is the second most…

Sebaceous Carcinoma Key Points Sebaceous carcinoma (SbC) is a rare malignant and potentially lethal tumor derived from the adnexal epithelium of sebaceous glands It represents 0.05% of all cutaneous malignancies…