Brain Teaser #7

A) Question:

True or False: From 2005 to present, breast cancer in women has been the second most common occurring cancer and the number one cause of cancer related deaths.

Please note, a majority of these brain teaser questions were the product of Sean Harris, an Upstate Medical University student.

A) Answer:


Follow Up:

According to the American Cancer Society, breast cancer is the most common type of cancer and the second leading cause of cancer related deaths in women.

B) Question:

In which breast and what quadrant is breast cancer most prevalent?

B) Answer:

Breast cancer is more common in the left breast and usually presents in the upper outer quadrant.

C) Question:

What is the most common pathology for patients with breast cancer?

C) Answer:

Infiltrating ductal carcinoma is the most common pathology in breast cancer, and it contributes about 70%-80% of all breast cancer cases.

D) Question:

According to the American Cancer Society, annual mammograms for low risk women should be performed after what age?

D) Answer:

Annual mammograms should be performed annually after the age of forty. The American Cancer Society suggests that an annual clinical breast exam and a monthly self breast exam be performed as well.

E) Question:

When treating breast cancer what is the most radiosensitive organ at risk?

E) Answer:

The lung is the most radiosensitive organ when treating breast cancer.

F) Question:

What is the TD5/5 for 2/3 of the lung?

F) Answer:

The TD5/5 for 2/3 of the lung is 3,000 cGy.

G) Question:

Name the three most common regional lymph nodes that may be of concern when treating breast cancer?

G) Answer:

The three most common lymph nodes that may be of concern are the axillary, supra-clavicular, and internal mammary lymph nodes.

H) Question:

When treating a tangential breast field, what do you usually not want the medial field boarders to do?

H) Answer:

Most of the time you don't want the medial boards to diverge.

Follow Up:

This can be accomplished many ways. One way is with a split beam technique, where you have your medial border on central axis. Another way is to compensate for the divergence is by having your tangential field angles have a greater then 180 degree hinge angle.

I) Question:

Please list the four different grades of skin reactions from least to most severe.

I) Answer:

From least severe to most server they go:

Dry desquamation
Moist desquamation

Follow Up:

Erythema- slight redness of the skin, occurs at about 1,500 cGy-2,000 cGy.
Dry desquamation-Occurs with the destruction of the sebaceous glands, usually after 3,000 cGy, and causes itching.
Moist desquamation-occurs over 4,000 cGy and blistering may occur
Necrosis-this is cellular death.


Author: Sean Harris
Co-Author: Adam Buell
Editors: Mary Hare
Date Created: June 2005