Proliferating epidermoid cyst
Encyclopedia
Proliferating epidermoid cysts (also known as "Proliferating epithelial cyst") are a cutaneous
Skin
-Dermis:The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbors many Mechanoreceptors that provide the sense of touch and heat...

 condition characterized by tumors that have deep invasion, and associated with anaplasia
Anaplasia
Anaplasia refers to a reversion of differentiation in cells and is characteristic of malignant neoplasms . Sometimes, the term also includes an increased capacity for multiplication. Lack of differentiation is considered a hallmark of aggressive malignancies. The term anaplasia literally means "to...

 and a high mitotic
Mitosis
Mitosis is the process by which a eukaryotic cell separates the chromosomes in its cell nucleus into two identical sets, in two separate nuclei. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two cells containing roughly...

rate.
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