Fine-Needle Aspiration of Sarcomas Metastatic to Lymph Nodes: A Cytomorphologic Study over a 10-Year Period.

Introduction: Metastasis of sarcomas to lymph nodes is an uncommon event in its natural history. We aimed to present our experience with fine-needle aspiration (FNA) of metastatic sarcomas to lymph nodes over a 10-year period.

Material and methods: The cytopathology archives were searched for FNA of lymph nodes involved by metastatic sarcomas. Available clinicopathologic data were recorded. All slides were retrieved and reviewed.

Results: Thirty-three lymph nodes, from 30 patients, with metastatic soft tissue sarcomas were identified. The lymph node metastases occurred in 16 males and 14 females (median age, 56 years). The size of the lymph nodes ranged from 1.2 to 7.5 cm (median size, 2.9 cm). The inguinal lymph nodes were the most commonly involved nodes, followed by thoracic and cervical neck nodes. The most common metastatic soft tissue sarcoma encountered was Kaposi sarcoma (n = 7, 23.3%), followed by angiosarcoma (n = 6, 20%) and rhabdomyosarcoma (n = 6, 20%). The most common site of primary soft tissue sarcoma was the head and neck (n = 8, 26.6%), followed by lower extremity (n = 7, 23.3%). The initial diagnosis of sarcoma was established in 6 cases. Seventen patients had metachronous involvement of lymph nodes, while the remaining patients had synchronous involvement. Seventen patients died of disease, and the survival after lymph node metastasis ranged from 1 to 43 months.

Conclusion: FNA is an accurate and effective method in the diagnosis of metastatic sarcoma to lymph nodes. Knowledge of clinical findings and primary tumor diagnosis along with careful assessment of the cytomorphology is extremely helpful for an accurate diagnosis of metastases.