FIGURE 1.

A 76-year-old man presented with dyspnea due to subglottic stenosis around cricoid cartilage (initial prostate-specific antigen [PSA], 216 ng/mL). ¹⁸F-FDG PET/CT was performed, revealing uptake in the prostate (SUVmax, 19.23), pelvic lymph nodes (SUVmax, 4.97), thoracic vertebra (T5) (SUVmax, 5.57), coxal bone (SUVmax, 3.75), cricoid cartilage (SUVmax, 6.97), and rib bone fractures. Biopsy revealed prostate adenocarcinoma with metastasis to cricoid cartilage (PSA-positive adenocarcinoma on immunohistochemistry). Maximum intensity projection image (A), the axial PET (B), CT (C), fused PET/CT (D), coronal fused PET/CT (E), and cricoid cartilage hematoxylin-eosin microphotograph (F) are shown. Few cases have been reported with neck metastases from prostate carcinoma. As for laryngeal metastases, only 13 cases have been reported as of 2001 in the literature, and 1 case was reported in 2018.^1,2 Recently, ¹⁸F-fluorocholine PET and ⁶⁸Ga–prostate-specific membrane antigen (PSMA) PET/CT detected cricoid or thyroid cartilage metastases from prostate adenocarcinoma.^3,4