Soo Yeon Hahn MD, Presenter: Nothing to Disclose

Boo-Kyung Han MD, PhD, Abstract Co-Author: Nothing to Disclose

Eun Young Ko MD, PhD, Abstract Co-Author: Nothing to Disclose

Jung Hee Shin MD, Abstract Co-Author: Nothing to Disclose

Seok Seon Kang MD, Abstract Co-Author: Nothing to Disclose

Ji-young Hwang MD, Abstract Co-Author: Nothing to Disclose

Mee Young Nam MD, Abstract Co-Author: Nothing to Disclose

To retrospectively evaluate the magnetic resonance (MR) imaging findings of microinvasive ductal carcinoma.

The MR imaging findings of 37 women (mean age, 48 years; range, 29-66 years) with surgically confirmed microinvasive ductal carcinomas between January 2004 and December 2008 were reviewed. Two radiologists assessed MR imaging findings as follows: (1) morphological and kinetic pattern, (2) enhancement degree, and (3) the absence or presence of additional underlying parenchymal enhancement.

Of 37 cases with microinvasive ductal carcinomas, 35 (95%) were demonstrated on MR imaging. Sixteen cases (46%) were identified as non-mass lesions with segmental (n=15) or linear (n=1) distribution. Nineteen cases (54%) were identified as mass lesions with gyriform (n=12), irregular (n=6), or lobulated (n=1) shape. Twenty of 35 enhancing lesions (57%) were associated with internal clustered ring enhancement pattern. Eighteen of 35 lesions (51%) exhibited washout pattern and 11 (31%) exhibited plateau pattern in kinetics. Enhancement degree was strong in 26 (74%) and mild in 9 (26%) cases. Eleven (31%) showed nodular (n=7) and diffuse parenchymal enhancement (n=4) in the background parenchyma of bilateral breasts.

The microinvasive carcinomas manifested mainly as segmental non-mass lesion or gyriform mass lesion with strong enhancement and internal clustered ring enhancement pattern on MR imaging. Awareness of these imaging findings should be helpful to predict a microinvasive carcinoma and to decide a surgical plan including axillary surgery.

This study identifies the MR imaging characteristics of microinvasive ductal carcinoma. The results of this study will help the diagnosis and treatment of microinvasive ductal carcinoma.

Hahn, S, Han, B, Ko, E, Shin, J, Kang, S, Hwang, J, Nam, M, MR Features of Microinvasive Ductal Carcinoma.  Radiological Society of North America 2009 Scientific Assembly and Annual Meeting, November 29 - December 4, 2009 ,Chicago IL. http://archive.rsna.org/2009/8014345.html