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Egyptian Journal of Radiology and Nuclear Medicine
Fig. 5 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 5

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. 5

Pathologically proven recurrent nasopharyngeal carcinoma following radiotherapy. In this case, biopsy and histopathological examination revealed nasopharyngeal carcinoma. However, the lesion was falsely diagnosed by diffusion-weighted imaging (DWI), i.e. wrongly interpreted as “post-treatment benign changes”. a Axial T2-weighted image (T2WI) showing a left nasopharyngeal thickening, with high signal intensity. b Axial fat-saturated T1-weighted image (T1WI) post-contrast sequence showing faint, inhomogenous, enhancement of the lesion. c Diffusion-weighted imaging (b1000) revealing the intermediate-to-low signal intensity pattern of the lesion. d Apparent diffusion coefficient (ADC) map revealing the mixed, intermediate-to-high, signal intensity pattern of the lesion, with a mean ADC value of 1.43 × 10−3/mm2; possibility of post-treatment benign changes, rather than tumour recurrence, was considered

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