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33 Special Types of Invasive Breast Carcinoma: Diagnostic Criteria ...

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Nassar et al. (AJSP 2006;30:501-7.)<br />

• Local recurrence in 5 pts, all with invasive carcinoma.<br />

• ~12% died <strong>of</strong> tumor in 1 to 4 yrs (mean, 2.3 yrs).<br />

• None died <strong>of</strong> noninvasive SPC.<br />

• 5 <strong>of</strong> 6 patients who DOD had invasive components.<br />

• Sixth pt died with “metastatic metastatic signet signet-ring ring cell carcinoma” carcinoma at 10 years<br />

had SPC with extravasated mucin, but the SPC lesion had signetring<br />

cells.<br />

• Conclusion: SPCs heterogeneous, arise in older pts, & have<br />

indolent behavior. LN & distant mets uncommon & limited to<br />

SPCs with (conventional) invasive components.<br />

Differential Diagnosis:<br />

4. Intraductal papilloma.<br />

5. Sclerosing papillary lesions or proliferations:<br />

scleroelastotic lesion simulating malignancy<br />

- scleroelastotic lesion simulating malignancy.<br />

- nonencapsulated sclerosing lesion.<br />

- indurative mastopathy.<br />

- complex sclerosing lesion.<br />

- invasive epitheliosis.<br />

- radial scar.<br />

- duct adenoma (? spectrum <strong>of</strong> sclerosing papillary lesions).<br />

10/8/2011<br />

43

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