Mammographic features of screening detected pT1 (a-b) invasive breast cancer using BI-RADS lexicon.
OBJECTIVE
To describe mammographic features in screening detected invasive breast cancer less than or equal to 10mm using Breast Imaging Reporting and Data System lexicon in full-field digital mammography.


METHODS
A retrospective analysis of 123 pT1 (a-b) invasive breast cancers in women aged 50-69 years from our screening program. Radiologic patterns were: masses, calcifications, distortions, asymmetries and mixed. Masses: shape, margins and density, and calcifications: morphology, number of flecks and size of the cluster were taken into account, following Breast Imaging Reporting and Data System terminology.


RESULTS
We found 61 masses (49.6%), 8 masses with calcifications (6.5%), 30 groups of calcifications (24.4%), 19 architectural distortions (15.4%), 1 architectural distortion with calcifications (0.8%), 4 asymmetries (3.2%). Sixty out of 69 masses were irregular in shape, 6 lobular, 2 ovals and 1 round. Thirty-four showed ill-defined margins, 29 spiculated and 6 microlobulated. Most of them showed a density similar to surrounding fibroglandular tissue. Calcifications were pleomorphic or fine linear in 24 of 30 (80%). Most of cases showed more than 10 flecks and a size greater than 1cm.


CONCLUSIONS
The predominant radiologic finding is an irregular, isodense mass those margins tend to share different descriptors, being ill-defined margins the most constant finding. Calcifications representing invasive cancer are predominantly pleomorphic with more than 10 flecks per cm. Architectural distortion and invasive tubular carcinoma are more common than reported in general series.
Department of Radiology (CDIC), Hospital Clínic de Barcelona, C/Villarroel, 170, 08036 Barcelona, Spain. xbarga@clinic.ub.es
Xavier
X
Bargalló
Gorane
G
Santamaría
Martín
M
Velasco
Montse
M
del Amo
Pedro
P
Arguis
Marta
M
Burrel
Sebastian
S
Capurro
D000368:Aged; D001943:Breast Neoplasms / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008327:Mammography / Q000706:statistics & numerical data*; D008403:Mass Screening / Q000706:statistics & numerical data*; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D015995:Prevalence; D011856:Radiographic Image Enhancement; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013030:Spain / Q000453:epidemiology; D009626:Terminology as Topic