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Fig. 4 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 4

From: Post-treatment benign changes versus recurrence in non-lymphoid head and neck malignancies: can diffusion-weighted magnetic resonance imaging end up the diagnostic challenge?

Fig. 4

Pathologically proven post-treatment benign changes following chemoradiation for nasopharyngeal carcinoma. In this case, biopsy and histopathological examination revealed tissue fibrosis with no malignancy. However, the lesion was falsely diagnosed by diffusion-weighted imaging (DWI), i.e. wrongly interpreted as “locoregional recurrence/residual tumour”. a Axial T2-weighted image (T2WI) showing an area of diffuse thickening within the posterior nasopharyngeal wall, being more prominent on the right side, with intermediate signal intensity. b Axial T1-weighted image (T1WI) post-contrast sequence showing inhomogeneous enhancement of the lesion. c Diffusion-weighted imaging (b1000) revealing the hyperintense pattern of the lesion. d Apparent diffusion coefficient (ADC) map revealing the hypointense pattern of the lesion, with a mean ADC value of 1.44 × 10−3/mm2 suggestive of tumour recurrence

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