Explain the Classification of Malignant Tumors

Malignant tumors can be classified as:

Carcinomas: These tumors arise from the epithelial lining (the squamous cells) e.g. skin, tongue, breast, stomach, large intestine (the latter three arise from the glandular tissues).

Sarcomas:  these arise from the connective tissue e.g.  bone, cartilage and fat.

Melanoma: arise from pigmented layers of skin e.g. pigmented moles.

Gliomas:  these arise from the central nervous system e.g. brain and spinal cord.

Reticulo -endothelial tumors: these involve the lymphatic system.

Adenoma:  the growth arises from a gland e.g. thyroid gland.