RESUMEN
BACKGROUND: EUS-guided fine needle aspiration biopsy (EUS-FNAB) of deep-seated lymphadenopathy is proposed to identify lymphoproliferative disorders when no superficial lesion is accessible. METHODS: We analyzed prospectively collected data of 115 EUS-FNABs from 73 thoracic or abdomino-pelvic targets in 52 patients with suspected lymphoproliferative disorders (LPDs) between January 2005 and May 2011 from a single institution. Conventional histology and immunohistochemistry procedures were performed on samples. RESULTS: No complications were recorded. An LPD was identified in 29 cases and ruled out in 21 cases. In 2 cases the analysis was negative, but an LPD was identified using a secondary procedure. For the identification of LPDs irrespective of subtype, this procedure has positive and negative predictive values of 100% and 91.3% respectively, with 93.6% sensitivity and 100% specificity. In 31 patients finally diagnosed with LPDs, an accurate diagnosis meeting the 2008 World Health Organization classification criteria was established in 21 (68%) cases, success being significantly associated with target size above 30 mm in multivariate analysis (odds ratio 7.47; p = 0.05). CONCLUSION: EUS-FNAB of deep-seated lymphadenopathy with conventional morphological assessment appears to have a high diagnostic value for LPD identification and can obviate invasive surgery. A sub-classification was possible in two thirds of the cases.