Table 1.

Magnetic resonance imaging findings in the 23 patients in the study.

MRI acquisition	Imaging feature	Number of cases
T2-weighted	Loss of prepectoral fat plane	23
CE MRI	Loss of prepectoral fat plane	22
	Enhancement of ribs	2
	Intercostal muscles	7
	Pectoralis muscle	19
DWI	Loss of prepectoral fat plane	*
	Restricted diffusion in ribs	2
	Intercostal muscles	6
	Pectoralis muscle	18

^*DWI alone was unable to ascertain loss of the prepectoral fat plane due to signal attenuation in this region. Posterior extent and assessment of chest wall invasion and pectoralis muscle invasion of known malignancies based on T2-weighted, dynamic CE, and DWI features were tabulated. CE: Contrast-enhanced, DWI: Diffusion weighted imaging, MRI: Magnetic resonance imaging