BACKGROUND: Our objetive is to assess the lymph node reactivity in patients with neck metastasis from occult primary tumor. METHODS: We perform a retrospective analysis of 24 patients submitted to neck dissection between 1983 and 1995 due to metastasis of occult primary tumor. Slices of 601 resulting lymph nodes was colored with hematoxilin-eosin and evaluated by optical microscopy. Lymph node reactivity patterns considered the presence of paracortical hyperplasia, germinal center hyperplasia and sinus hyperplasia. We evaluated relationship between lymph node reactivity, capsular rupture, necrosis and desmoplasia with relapse of disease. Statiscal analyses were performed through a Fisher Test with 2 error less than 5%. RESULTS: Seventy seven percent of the lymph nodes were reactive. Fifty five percent of patients with paracortical or mixed hyperplasia and 16% of the patients with germinal center hiperplasia or non reactive lymph nodes were free of disease at the longest follow up (p=0,11). The presence of necrosis and desmoplasia showed a significant relation (p=0,02). CONCLUSIONS: The lymph node reactivity is usual in the great majority of primary unknown metastasis; tumoral necrosis is directly related with desmoplasia.
Occult primary; Lymph nodes; Metastasis; Cancer
