Treatment response, as determined by axial T1-weighted contrast-enhanced magnetic resonance imaging (MRI), in a 12-year-old nasopharyngeal carcinoma (NPC) patient with a small tumor coexisting with hypertrophic adenoids. A, before treatment, the NPC originated in the roof of the nasopharynx (short arrows) and could not be clearly distinguished from hypertrophic adenoids (long arrow). B, 10 days after the end of neoadjuvant chemotherapy, a partial response (PR) was achieved for the tumor (short arrows), and stripes (long arrow) became visible in hypertrophic adenoids. C, 3 months after the end of radiotherapy, a complete response (CR) was achieved for the tumor, a PR was demonstrated for hypertrophic adenoids, and the stripes on hypertrophic adenoids became more visible (long arrow). Note that hypertrophic adenoids were asymmetric (short arrow) most likely because of previous tumor invasion.