CRO Study Exam 2 Questions & Answers 2024/2025
What are the most common malignancies in the US? - ANSWERSBasal Cell Carcinoma (BCC) and Squamous Cell Carcinoma (SCC) of skin are the most common malignancies in the US
What is the most common predisposing factor for skin cancer? - ANSWERSUV e...
What are the most common malignancies in the US? - ANSWERSBasal Cell Carcinoma (BCC) and
Squamous Cell Carcinoma (SCC) of skin are the most common malignancies in the US
What is the most common predisposing factor for skin cancer? - ANSWERSUV exposure
What are the five major therapies recommended for skin cancer treatment? -
ANSWERSCurettage/electrodessication, chemotherapy, surgical excision, Moh's microsurgery, and RT
Curettage and Electrodessication: Technique - ANSWERSThis method uses a sharp curette to scrape away
the friable tumor tissue until normal, firm dermis is felt. The area is first electrodessicated to cause
necrosis of cells. The necrotic debris is then curetted to the base of the wound and the cycle is repeated
up to two more times if indicated.
Moh's microsurgery - ANSWERSa state-of-the-art outpatient procedure that enables the physician to
remove as little normal tissue as possible. During this surgery, the physician removes the cancer and
then uses a microscope to look at the cancerous area to make certain no cancer cells remain.
What modality of radiation is commonly used to treat skin cancer? - ANSWERSSuperficial/orthovoltage x-
rays and megavoltage electrons are most commonly used to cure skin cancers.
What are the advantages of using orthovoltage to treat skin cancer? At what tumor depth is
orthovoltage NOT appropriate to treat the lesion? - ANSWERSOrthovoltage advantages are: less margin
on skin surface, less expensive than electrons, dmax at skin surface, skin collimation with lead cutout.
Orthovoltage is not appropriate for >1 cm deep lesions.
Describe the shielding used to block critical structures when using radiotherapy for skin cancer and what
structures should be shielded. - ANSWERSused to block the lens, cornea, nasal septum, teeth.
Backscattered electrons/photons can lead to conjunctival/mucosal irritation. For eyelids, thin coating of
dental acrylic/wax should be used, for other areas a thicker coating should be applied.
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