PURPOSE: To assess the use of mammography in diagnosis of pregnancy-as
sociated breast cancer (PABC). MATERIALS AND METHODS: A retrospective
review of medical records between 1973 and 1993 was performed in 85 wo
men with breast cancer diagnosed during pregnancy or within 1 year aft
er pregnancy. In 21 of these women, mammography was performed before b
iopsy; the mammographic findings in this study group, which had 23 cas
es of invasive carcinoma, were reviewed for signs of malignancy. Breas
t sonography was performed in six cases in five women; sonographic fin
dings were also reviewed. RESULTS: Mammographic findings were present
in 18 of 23 cases (78%), including mass (n = 13) (nine cases with calc
ification), suspicious calcifications (n = 4), and diffusely increased
parenchymal density (n = 1). Breast sonography revealed focal solid m
ass in six of six cases. Axillary lymph node metastases occurred in 15
of 23 cases (65%). Although symptoms occurred before or during pregna
ncy in 12 cases (52%), PABC was diagnosed after pregnancy in 19 cases
(83%). CONCLUSION: PABC is often advanced at diagnosis and associated
with poor prognosis. Breast imaging studies usually demonstrate focal
findings due to clinically evident PABC.