1. MedPix Medical Image Database COW - Case of the Week Case Contributor: Stephen John Buetow Affiliation: National Capital Consortium

2. MedPix No: 4353 - History Pt Demographics: Age = 45 y.o. Gender = woman 45 year old female with a history of DCIS in the upper outer quadrant of the right breast and a infiltrating ductal carcinoma in the left breast in 1996. Downloaded by (-1)

3. MedPix No: 4353 - EXAM & LABS

4. synchronous contralateral breast cancer There is a large round dense spiculated mass in the upper outer quadrant of the left breast (displayed on the right). There is another smaller spiculated mass far posteriorly in the inner lower quadrant of the right breast (displayed on the left). Downloaded by (-1)

5. synchronous contralateral breast cancer There is a large round dense spiculated mass in the upper outer quadrant of the left breast (displayed to the right). There is another smaller spiculated mass far posteriorly in the inner lower quadrant of the right breast (displayed to the left). Downloaded by (-1)

6. FINDINGS

7. DIFFERENTIAL DIAGNOSIS What is your Differential Diagnosis?

8. Diagnosis: synchronous contralateral breast cancer Left breast: Infiltrating Ductal Carcinoma with focal DCIS. Right breast: Infiltrating Ductal Carcinoma. Dx Confirmed by:

9. DISCUSSION