Utility and morphologic features of granulomas on rapid on-site evaluation of endobronchial ultrasonography-guided fine-needle aspiration

IntroductionEndobronchial ultrasonography (EBUS)-guided fine-needle aspiration (FNA) is increasingly used to sample central lung lesions and mediastinal lymphadenopathy. We investigate the utility of EBUS-guided FNA and concomitant rapid on-site evaluation (ROSE) to diagnose granulomas, the morphologic characteristics of granulomas on ROSE, and how the diagnosis of granulomas changed the clinical impression.Materials and methodsAll pathologic reports and associated clinical records of patients who had EBUS-guided FNA of the lungs or mediastinal lymph nodes that yielded granulomas were reviewed with at least a 1-year follow-up after EBUS-guided FNA. All ROSE slides were rereviewed to evaluate granulomas for quantity, necrosis, and cohesion.ResultsOver a 3-year period, 882 EBUS-guided FNAs were performed. One hundred and twelve patients (49% male, average age 50.8 years, range 16-83) had 161 EBUS-guided FNAs that yielded granulomas (18%). The etiologies of the granulomas were as follows: sarcoidosis (54%), infection (12%), malignancy (5%), inflammatory bowel disease–related lymphadenopathy (1%), and no specific clinical etiology (28%). Of the patients with EBUS-guided FNAs, 98 had ROSE performed (87.5%) and granulomas were seen in 70 of these patients (71%). Granulomas associated with sarcoidosis were mostly well-formed and non-necrotizing (90%). The results of the EBUS-guided FNA changed or redefined the clinical diagnosis in 79 patients (71%).ConclusionsEBUS-guided FNA with concurrent ROSE is a useful technique for the diagnosis of granulomas. The quality and quantity of granulomas detected during ROSE may suggest an etiology and help direct ancillary testing.