Squamous cell carcinoma is a potentially invasive tumor derived from surface epithelium. In the early stages, the normal epithelial cells are replaced by atypical squamous cells throughout the epidermis, resulting in a loss of normal maturation. This stage is sometimes referred to as squamous cell carcinoma in situ. After the dysplastic squamous cells encroach beyond the borders of the basement membrane, the lesion is referred to as invasive squamous cell carcinoma.
While no single causative agent for the development of squamous cell carcinoma has been identified, it is clear that ultraviolet radiation is a substantial risk factor and demonstrates a distinct association with this disease. This is supported by the fact that the majority of squamous cell tumors arise on the lower lid margin and medial canthus, the two periocular areas most susceptible to sunlight exposure. Increasing age and northern European descent are two other commonly associated factors in patients with squamous cell carcinoma.
Monday, March 9, 2009
The Health Department is blog dedicated to my colleagues especially those who are starters in nursing. Most of the files posted here are not mine but was given to me for this blog to publish. The articles here are not all mine and some are from my friends from college who still continues to help me build this blog. By sending me your nursing files, you can help our colleagues in searching for better nursing files. Don't worry guys, I'll be giving you proper credit to the files you'll share to us if you want. Email us at firstname.lastname@example.org I believe that we, as nurses/bloggers, can create a great community. I mean there are so many people living and blogging all around the world why should we not try and accomplish something together?