tuberculosis currently represents a cause of high morbidity and mortality in children, with higher incidence in infants and adolescents. clinical manifestations in children are nonspecific and absent in some cases, which delays diagnosis. the diagnosis of tuberculosis depends on the isolation and microbiological identification and culture of Mycobacterium, which has been reported in 13.5% and 40% respectively, which makes it difficult bacteriological response in infants. We describe the case of a eleven month old infant with chronic malnutrition, admitted due to an adenomegalic syndrome and liquid diarrhea, with nonspecific symptoms, a chest x-ray suggestive of pneumonia, who does not improve with antibiotic therapy. the neck cAt scan with contrast showed bilateral supraclavicular adenomegalies, for which reason other etiological agents were sought. despite negative result for the tuberculin test, antituberculous treatment was initiated, with a favorable clinical course. Final report for Koch bacillus in gastric content and culture were positive for tuberculosis. lymph node pathological study was suggestive of Mycobacterium tuberculosis infection. [ABSTRACT FROM AUTHOR]