Invasive Mucinous Adenocarcinoma Mimicking Organizing Pneumonia Associated with Mycobacterium fortuitum Infection

Daisuke Morichika; Nobuaki Miyahara; Katsuyuki Hotta; Yoshiko Okamoto; Daisuke Minami; Masahiro Irie; Yasushi Tanimoto; Arihiko Kanehiro; Mitsune Tanimoto; Katsuyuki Kiura

doi:10.2169/internalmedicine.53.2783

CASE REPORTS

Invasive Mucinous Adenocarcinoma Mimicking Organizing Pneumonia Associated with Mycobacterium fortuitum Infection

Daisuke Morichika, Nobuaki Miyahara, Katsuyuki Hotta, Yoshiko Okamoto, Daisuke Minami, Masahiro Irie, Yasushi Tanimoto, Arihiko Kanehiro, Mitsune Tanimoto, Katsuyuki Kiura

Author information

Daisuke Morichika
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Nobuaki Miyahara
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Katsuyuki Hotta
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Yoshiko Okamoto
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Daisuke Minami
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Masahiro Irie
Department of Thoracic Surgery, Okayama University Hospital, Japan
Yasushi Tanimoto
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Arihiko Kanehiro
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Mitsune Tanimoto
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
Katsuyuki Kiura
Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan

Keywords: mucinous adenocarcinoma, organizing pneumonia, pulmonary nontuberculosis, Mycobacterium fortuitum

JOURNAL OPEN ACCESS

2014 Volume 53 Issue 24 Pages 2795-2799

DOI https://doi.org/10.2169/internalmedicine.53.2783

Details

Abstract

We herein report the case of a 68-year-old man diagnosed with invasive mucinous adenocarcinoma of the lungs. Chest computed tomography showed subpleural ground-glass opacity and small nodules with cavitation. A culture of the bronchoalveolar lavage fluid resulted in the detection of Mycobacterium fortuitum. The patient's lung consolidation rapidly progressed; however, repeated bronchoscopy showed no atypical cells, thus suggesting a diagnosis of organizing pneumonia associated with M. fortuitum infection. However, the surgical biopsy specimen was diagnostic for adenocarcinoma, with no mycobacterial infection. Invasive mucinous adenocarcinoma should not be excluded in the differential diagnosis of patients with clinical features of organizing pneumonia and nontuberculous mycobacterium infection, even if a transbronchial biopsy confirms the absence of malignancy.

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