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Egyptian Journal of Radiology and Nuclear Medicine
Fig. 3 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 3

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. 3

Pathologically proven recurrent adenoid cystic carcinoma of the left parotid gland following parotidectomy and adjuvant radiotherapy. a Axial T1-weighted image (T1WI) showing a well-defined lesion of low signal intensity at the operative bed of the previous left parotidectomy. b Axial T2-weighted image (T2WI) showing the high signal intensity 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 0.96 × 10−3/mm2 suggestive of tumour recurrence

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