[Investigation for cervical lymph node metastasis in unknown primary sites]

Area of Science:

• Oncology
• Head and Neck Surgery
• Diagnostic Imaging

Context:

• Cervical adenopathy with an undetectable primary tumor presents diagnostic and therapeutic challenges.
• Accurate staging and primary site identification are crucial for effective management.
• Previous studies highlight the difficulty in locating the primary tumor in a significant proportion of cases.

Purpose:

• To evaluate diagnostic methods for identifying the primary tumor in patients with cervical lymph node metastasis of unknown origin.
• To assess treatment strategies and survival outcomes in this patient cohort.
• To determine the impact of diagnostic interventions and treatment modalities on patient survival.

Summary:

• This study analyzed 36 patients with cervical lymph node metastasis of unknown origin, detecting primary sites in 20 before treatment and 11 after treatment.
• Diagnostic tools included random biopsy, panendoscopy, and imaging (FDG-PET). Random biopsy identified primary sites in 14.3% of cases.
• Overall survival was 63.7%, with significantly better outcomes for patients undergoing neck surgery (85.7% vs. 38.9%).

Impact:

• The findings underscore the importance of comprehensive evaluation including CT, MRI, FDG-PET, and panendoscopy with random biopsy for primary site detection.
• For undetected primary sites, initial treatment should involve combined surgery, chemotherapy, and radiotherapy for cervical adenopathy.
• Long-term follow-up is essential for identifying the primary lesion after initial treatment.