Skin Cancer

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Skin Cancer
2014-02-10 17:11:59
Radiation Therapy

Skin Cancer, Mosby review questions
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  1. Nonmelanomas have higher mortality rates than melanomas(T/F)
  2. The most common cancer type overall in the United States is nonmelanoma skin cancer(T/F)
  3. Melanomas are usually tan or black in color.(T/F)
  4. In late stage disease, melanomas tend to ulcerate and have rolled border on examination.(T/F)
    FALSE( This is indicative of late stage BCC or SCC)
  5. Control rates for stage I basal cell carcinoma are approximately:
  6. Clark method for classifying melanoma is based on:
    depth of invasion
  7. Write three statements for increasing public awareness of prevention of skin cancer.
    • 1)use sun protection
    • 2)check skin for changes in moles(ABCD)
    • 3)see a doctor is anything suspicious
  8. the skin serves many functions-list three
    • 1)protection
    • 2transport
    • 3)regulation of body temp(homeostasis)
  9. all the following are etiologic factors for skin cancers EXCEPT:
    1)ultraviolet radiation exposure
    2)chemical carcinogens
    3)Epstein-Barr virus
    4)Genetic albinism
    Epstein-Barr virus
  10. melanocytes are found in the _____layer of the skin
    basal(stratum  basale of the epidermis)
  11. Cells most sensitive to radiation are located in which layer of the epidermis
    stratum  basale
  12. which of the following activities increases the risk of skin cancer:
    frequent visits to tanning salon
  13. Nonmelanoma type skin cancers are not usually seen in children. Why?
    because they are the result of long-term exposure to UV rays
  14. Lentigo maligna is a histologic type of melanoma characterized by:
    Growth in a radial pattern with tan or black color
  15. What role does immunotherapy play in the management of melanoma?
    Because melanoma can regress, giving the immune system a boost may help fight melanoma
  16. Expected side effects from RT for nonmelanoma skin ca(include doses they appear):
    (dose is 40-50 Gy in 2 Gy fxs)
    • 1)erythema (20 Gy)
    • 2)Dry desquamation (30 Gy)
    • 3)wet desquamation (40 Gy)
  17. Depth of invasion for a SCC of the skin is 4 cm. Physician prescribe dose for coverage by the 90% dose line. What electron energy would you choose?
    16  Mev [4(for 90%) times 4(depth)]
  18. A pt has a nonmelanoma located on the lower eyelid. Discuss positioning and field arrangements.
    • lead eyeshields
    • electrons with e-cutout
    • gantry and couch angles to have beam perpendicular to treatment surface(parallel to horizontal axis of the beam)
  19. why use a lead shield in nostrils when treating lesion on nose?
    to protect the underlying mucosa

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