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42 year old woman with Grave’s disease and lymphoid thymic hyperplasia. (A) Contrast-enhanced CT shows mass-like thymic enlargement (arrow). With such an appearance, thymic hyperplasia, a thymic epithelial neoplasm or lymphoma involvement of the thymus cannot be distinguished one from another. (B, C) MRI with in and out of phase imaging shows drop in signal intensity consistent with thymic hyperplasia (arrow), obviating the need for further investigation or biopsy.
