Abstract
The occurrence of malignant lymphoma as a secondary duplication of head and neck cancer is rare. The patient was a 67-year-old man with superficial hypopharyngeal carcinoma who underwent endoscopic laryngo-pharyngeal surgery three times. The pathological diagnosis was squamous cell carcinoma, pT2, pT2, and pT1, respectively. At 11 months after the first endoscopic laryngo-pharyngeal surgery, cervical ultrasonography showed lymphadenopathy with loss of lymphatic hilum on the left Level IB, and FDG/PET-CT showed hyper-accumulation of FDG. 18 months later, lymphadenectomy was performed and the diagnosis of follicular lymphoma was confirmed. When occult cervical lymph node metastasis is located at an atypical site, rare conditions such as complications of malignant lymphoma should be considered. Lymph node biopsy may be useful if cytology does not provide a definitive diagnosis.
