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MRI Appearance of Accessory Breast Tissue: A Diagnostic Consideration for an Axillary Mass in a Peripubertal or Pubertal Girl

Tal Laor1, Margaret H. Collins2, Kathleen H. Emery1, Lane F. Donnelly1, Kevin E. Bove2 and Edgar T. Ballard2

1 Department of Radiology, Cincinnati Children's Hospital Medical Center and University of Cincinnati College of Medicine, 3333 Burnet Ave., Cincinnati, OH 45229-3039.
2 Department of Pathology, Cincinnati Children's Hospital Medical Center and University of Cincinnati College of Medicine, Cincinnati, OH.



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  		Fig. 1A. —15-year-old girl with axillary mass. Transverse sonogram of left axilla shows relatively well-defined mass composed of heterogeneous echotexture (arrow).

 


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  		Fig. 2A —12-year-old girl with axillary mass. Coronal T1-weighted MR image (TR/TE, 400/14) of right axilla shows poorly defined mass (arrow) of heterogeneous signal intensity. Inferior part of mass is hyperintense, consistent with fat.

 


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  		Fig. 3. —Axial fat-suppressed T2-weighted MR image (TR/TE, 3,500/85) of left axilla in 16-year-old girl with her arm raised over her head shows superficial band-like mass of increased signal intensity (arrow) with interspersed suppressed fat signal.

 


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  		Fig. 1B. —15-year-old girl with axillary mass. Axial fat-suppressed T1-weighted MR image (TR/TE, 600/22) after IV contrast administration shows mild enhancement of left axillary mass (arrow). Signal intensity corresponding to fat is more abundant in mass than in ipsilateral breast. Note that mass is not contiguous with normal, enhancing breast tissue (asterisk).

 


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  		Fig. 2B —12-year-old girl with axillary mass. Photomicrograph of histology slide of mass shows lobules of breast tissue in center and adipose tissue in upper left corner of photograph. (200x)

 

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