Malignant SKIN TUMOR AT AGLANCE
( Basal Cell Carcinoma, Squamous Cell Carcinoma, Malignant Melanoma )
Definition
Malignant skin tumor is a disease characterized by the growth of skin cells that are not controlled, can damage surrounding tissue and can spread to other parts of the body. Because the skin consists of several types of cells, the skin cancer also vary according to cell type affected.
Epidemiology
Adult skin cancer tend to have increased in number especially in the Americas, Australia and Britain. Based on several studies, those white people are more likely to suffer this type of skin cancer. It is predicted as a result of their frequent exposure (lots of exposure) sunlight. In Indonesia people with skin cancer is fairly small compared to the third-countries, however, skin cancer needs to be understood because in addition to causing defects (damage the appearance) is also at an advanced stage can be fatal to the patient (1).
Malignant skin tumor types that are found throughout the world are basal cell carcinoma (basalioma), squamous cell carcinoma, a relatively non melanoma and malignant melanoma. Basal cell carcinoma is the most common. In America, about 800,000 people suffering this cancer every year. 75% of skin cancer are basal cell kanser. Squamous cell carcinomas are found to be what the 200,000 Americans each year. Melanoma is the most rare but cause the most deaths. According to WHO, as many as 160,000 people suffering melanoma each year and as many as 48 000 deaths are reported each year (3).
Skin Embryology (4)
The skin has a double origin:
(A) the superficial layer (epidermis), formed from the surface ectoderm.
(B) inner layer (dermis), derived from the underlying mesenchyme.
A. Epidermis
At first, the embryo diilapisi by a single layer of ectoderm cells (Fig. 20.1A). At the beginning of the second month, the epithelium is split and formed a flat layer of cells, or epitrikium periderm, on its surface (Figure 20.1B). In the subsequent cell proliferation in the basal layer, forming a third zone (intermediate zone) (Figure 20.1C). Finally, at the end of the fourth month, the epidermis obtain definitive arrangement, and can be recognized four layers (Fig. 20.1D)