PMC3736967_01
Initial MRI demonstrated a chest wall mass lesion with an intermediate signal on T1-weighted imaging (a) and an intermediate signal on T2-weighted imaging (b). The boundary between the mass lesion and muscle seemed clear
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The signal was isointense on T1-weighted imaging (T1WI) and hyperintense on T2-weighted imaging (T2WI) (Fig. 1).
MRI scan after 7 years of follow-up demonstrated a small subcutaneous mass lesion. The signal from both T1WI (a) and T2WI (b) was almost the same compared to the ordinary mass lesion
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The MRI signal of this subcutaneous mass was almost identical with the original mass (Fig. 2).
Both mass lesions exhibited high signals on DWI (a, c) and low signals on ADC maps (b, d)
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Diffusion-weighted imaging (DWI) was performed and both lesions exhibited high signal on DWI and a low apparent diffusion coefficient (ADC) (about 0.5) on the ADC map (Fig. 3).
Pathological findings of both original (a) and subcutaneous (b) mass lesions representing marginal zone B-cell malignant lymphoma (H&E stain)
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The mass lesions were both found to be marginal zone B-cell lymphomas (Fig. 4).    