title: Pulmonary nodule due to Mycobacterium haemophilum in an immunocompetent host.
abstract: We present a case of a pulmonary nodular lesion in an immunocompetent patient documented at open lung biopsy to be due to Mycobacterium haemophilum. This organism has recently been recognized as a cause of disease in immunocompromised patients, presenting predominantly as skin lesions, arthritis, and rarely pneumonia. Because this mycobacterium is fastidious and difficult to grow without the use of special media and conditions, our case raises the possibility that M. haemophilum could be an underrecognized cause of granulomatous pulmonary lesions and should be considered particularly in cases where smears for acid-fast bacteria are positive but cultures are negative.
authors.affiliation: Pulmonary Services, Memorial Sloan Kettering Cancer Center, Cornell University College of Medicine, New York, New York, USA. whited@mskcc.org
authors.forename: D A
authors.initials: DA
authors.lastname: White
authors.forename: T E
authors.initials: TE
authors.lastname: Kiehn
authors.forename: A Y
authors.initials: AY
authors.lastname: Bondoc
authors.forename: S A
authors.initials: SA
authors.lastname: Massarella
mesh_terms: D005260:Female; D006801:Humans; D007121:Immunocompetence; D008168:Lung / Q000000981:diagnostic imaging; D008875:Middle Aged; D009164:Mycobacterium Infections / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000276:immunology; D018393:Mycobacterium haemophilum; D003074:Solitary Pulmonary Nodule / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000276:immunology / Q000382:microbiology; D014057:Tomography, X-Ray Computed