Abstract
Purpose
The aim of this study was to describe magnetic resonance imaging (MRI) patterns in 21 patients with histologically proven invasive lobular cancer (ILC) of the breast.
Materials and methods
We retrospectively reviewed MR images of 21 out of 24 women with ILC of the breast. Three women were excluded from the study because they underwent neoadjuvant chemotherapy after MRI. Thirteen of the 24 women had positive clinical findings. All 24 patients underwent mammography, sonography and MRI. MRI was performed to evaluate disease extent and multifocality/multicentricity before modified radical mastectomy (n=5) or quadrantectomy (n=16). Two experienced radiologists reviewed the MRI scans and described the tumour patterns.
Results
We identified five morphological patterns of ILC: a solitary mass with irregular margins (n=8); a mass with smooth margins (n=5); multiple small enhancing foci with interconnecting enhancing strands (n=4); dominant lesion surrounded by small foci (n=3); one MR examination was negative.
Conclusions
Architectural and dynamic features are important in the interpretation of breast MRI findings. ILC may be detected on MRI as solitary or multiple lesions that correspond to tumour morphology on pathologic examination. False-negative MRI findings do occur in a small percentage of ILC.
Riassunto
Obiettivo
Descrivere le caratteristiche RM di 21 pazienti con carcinoma lobulare della mammella (ILC) istologicamente confermato.
Materiali e metodi
Sono state retrospettivamente valutate le immagini RM di 21 su 24 donne portatrici di ILC della mammella. Tre donne sono state escluse dallo studio, in quanto sottoposte a chemioterapia neo-adiuvante dopo l’indagine RM. Tredici donne su 24 presentavano una obiettività clinica. Tutte le 24 pazienti sono state sottoposte a mammografia, ecografia della mammella ed RM. RM è stata effettuata per valutare l’estensione locale di malattia e l’eventuale presenza di multifocalità o multicentricità, prima che le pazienti fossero sotttoposte a mastectomia radicale modificata (n=5) o quadrantectomia (n=16). Due radiologi esperti in diagnostica senologica hanno rivisto le immagini RM e descritto i patterns morfologici delle lesioni tumorali riscontrate.
Risultati
Sono stati riscontrati 5 patterns morfologici di ILC: una formazione espansiva singola a bordi irregolari (n=8); una formazione espansiva singola a bordi netti (n=5); piccoli foci multipli di impregnazione contrastografica interconnessi tra loro (n=4); una formazione espansiva principale circondata da piccoli foci satelliti (n=3); una indagine RM negativa.
Conclusioni
Le caratteristiche morfologiche e dinamiche sono importanti nell’interpretazione della RM mammaria. ILC può essere identificato dalla RM sulla base della presenza di lesioni solitarie o multiple, che corrispondono ai reperti anatomo-patologici. Indagini RM negative sono rare, ma possibili in una bassa percentuale di ILC.
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Levrini, G., Mori, C.A., Vacondio, R. et al. MRI patterns of invasive lobular cancer: T1 and T2 features. Radiol med 113, 1110–1125 (2008). https://doi.org/10.1007/s11547-008-0308-z
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DOI: https://doi.org/10.1007/s11547-008-0308-z