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Old 04-08-2011
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Question Radiotherapy; Pick the correct statement

Which of the following statements are correct?

1. Cartilage and muscle tissue are radiosensitive.
2. The marrow and lymphoid system are the least radiosensitive tissues of the body.
3. A testicular germ cell tumor may be cured with radiation.
4. Postradiation sarcomas may develop after 3 months.
5. One thousand rads of total body radiation is safe.
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Old 04-08-2011
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1. and 3. are correct
2., 4., and 5. are incorrect
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Old 04-08-2011
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High Radiosensitivity
Lymphoid organs, bone marrow, blood, testes, ovaries, intestines

Fairly High Radiosensitivity
Skin and other organs with epithelial cell lining (cornea, oral cavity, esophagus, rectum, bladder, vagina, uterine cervix, ureters)

Moderate Radiosensitivity
Optic lens, stomach, growing cartilage, fine vasculature, growing bone

Fairly Low Radiosensitivity
Mature cartilage or bones, salivary glands, respiratory organs, kidneys, liver, pancreas, thyroid, adrenal and pituitary glands

Low Radiosensitivity
Muscle, brain, spinal cord
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Old 04-08-2011
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The correct answer is C. testicular germ cell tumour may be killed by radiation

Muscle and cartilage tend to radioresistant. not radiosensitive. this is due to the fact that they have a slow turnover rate and are affecting less during cell cycling than cells in the bone marrow or git.
marrow and lymphoid are the most radiosensitive.
sarcomas develop after 20 years...
one thousand rads can kill.....
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