False-positive findings at the base of the left pterygoid process on conventional CT images alone in a 63-year-old woman with nasopharyngeal carcinoma.

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Presentation transcript:

False-positive findings at the base of the left pterygoid process on conventional CT images alone in a 63-year-old woman with nasopharyngeal carcinoma. False-positive findings at the base of the left pterygoid process on conventional CT images alone in a 63-year-old woman with nasopharyngeal carcinoma. Coronal contrast-enhanced CCT images (A, soft-tissue window; B, bone window) show nasopharyngeal tumor (T) and bone sclerosis at the left base of the pterygoid process (arrow). The case was given a score of 3 based on CCT images alone. Bone subtraction iodine image (C) and color fusion image (D) clearly show no enhancement in the sclerotic area (arrow). E, A corresponding slice on the T1-weighted image shows low signal intensity due to sclerosis (arrow). F, Fat-suppressed T1-weighted images after gadolinium administration show contrast enhancement of the tumor mass and poor enhancement of the pterygoid process (arrow). This was considered a case of clinical T2 category disease without skull base invasion and was treated by chemoradiotherapy. T. Hiyama et al. AJNR Am J Neuroradiol 2019;40:135-141 ©2019 by American Society of Neuroradiology