Fig. 5
From: PET-CT detection of local residual laryngeal carcinoma after definitive (chemo)radiotherapy
Example of a false positive interpretation in the case of cricoid cartilage radionecrosis in a T4aN0 tumor. (a) Post-treatment PET-CT showed a markedly increased uptake of SUVmax 8.3 at the right posterior vocal cord and arytenoid region, along with a mass, at the site of the primary tumor. The axial image (b) shows small, fragmented arytenoid cartilage (arrow). A subsequent laryngoscopy revealed defects in the mucosa and exposed cartilage. The biopsy was negative for residual disease. The patient developed difficulty in breathing and a laryngeal oedema, and was tracheostomized. Symptoms resolved after antibiotics and hyperbaric oxygen therapy, which were started due to suspected chondroradionecrosis. (c) In the follow-up PET-CT 8 months later, SUVmax had markedly decreased to 3.6