Breast Cancer Mammogram Screening

[samkern]

Hi,

I am currently studying for Internal Physician Exam and I was wondering if anyone can help me answering some MCQs.

Those questions are good clinical questions that everyone can benefit from.

with anticipated thanks

Cheers
Sam

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QUESTION
Mammogram screening has a sensitivity of 90% and a specificity of 95% for detecting breast cancer. The incidence of breast cancer in 40 - 60 year old females is 5 in 1000.

In this population, what percentage of abnormal mammograms will be false
positives?

A. 5%
B. 10%
C. 25%
D. 45%
E. 90%

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