ARRS 2022 Abstracts


E1046. Ectopic Breast Tissue: Compendium of Confusion
  1. Temitope Soyemi; SUNY Downstate Medical Center
  2. Christian Fourquet; SUNY Downstate Medical Center
  3. Mossum Sawhney; SUNY Downstate Medical Center
  4. Neesha Patel; SUNY Downstate Medical Center
Ectopic breast tissues (EBT) may be located anywhere along the embryonic mammary line, and rarely beyond the mammary line. Reported incidence ranges between 0.2 and 6.0% with higher incidence in Asians and Caucasians. In most cases, EBT are asymptomatic, and found incidentally during imaging. They are likely to mimic other pathologies and are susceptible to the same pathological processes that affect normal breast tissue. There is currently no algorithm for imaging pathologies of EBT. This education exhibit aims to review different imaging modalities that have been utilized, the imaging appearances and pathological changes within EBT when available.

Educational Goals / Teaching Points
Educational goals include the review of epidemiology and common locations of ectopic breast tissue, presentation of cases showcasing different pathologies and reviewing imaging appearances on different modalities.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Painless bilateral axillary swelling in a postpartum, lactating female. Grayscale ultrasound demonstrated bilateral ectopic breast tissue. Left axillary painful mass in a pregnant female. Grayscale ultrasound showed ectopic breast tissue containing a simple cyst. Right vulva painless mass thought to represent inguinal lymphadenopathy. Contrast-enhanced computed tomography axial and reformatted images showed superficial, poorly enhancing soft tissue lesion. Pathological examination was consistent with fibroadenoma in EBT. Right axillary painful swelling. Mediolateral oblique view mammogram showing a lucent axillary lesion with few superimposed lymph nodes. Grayscale ultrasound showed a well-circumscribed, wider than tall, hyperechoic lesion. Pathological diagnosis compatible with hamartoma, adeno-lipomatous type.

There is no consensus on the imaging algorithm for EBT, but it may be an incidental finding during imaging of other pathologies. However, when they become symptomatic, choice of imaging modality is dependent on location and suspected pathology. Excisional biopsy is not always indicated but may be necessary for final pathological diagnosis.