Fig. 12

Various radiological appearances of lymphoma: three cases. Patient 1 (A–D) is an 88-year-old male presenting with a swelling in the right parotid gland, which increased in size for 6 weeks. T1-w axial image (A) shows a large, relatively hypointense, homogeneous mass lesion (star) on the right; the lesion is slightly more hyperintense on T2-w (B). The lesion shows very high signal on the DWI (C) with very low signal on the ADC maps (D) revealing the marked diffusion restriction. This was proven by biopsy to be a NHL. Patient 2 (E–H) is a 66-year-old male with an unclear swelling in the left parotid gland. There were two nodules in the parotid gland on the left. The T1-w image (E) shows one lesion (arrow) which is hypointense to the parotid gland and isointense to the skeletal muscles on T1-w, the lesion appears more hyperintense on T2-w images (F) but it is still slightly hypointense to the parotid gland. Furthermore, the diffusion-weighted image (G) and ADC map (H) show marked diffusion restriction. This was a case of follicular NHL. Patient 3 (I–L) is a 36-year-old male with Sjögren’s syndrome. Axial T1-w (I) and axial T2-w (J) images show the diffuse enlargement of the parotid glands with multiple small cysts (black arrow). The DWI (K) shows some hyperintensity in the parotid gland with a low signal in the ADC map (L) indicating diffusion restriction. This was proven to be extranodal marginal zone lymphoma of the parotid gland