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Volume 32, Number 3—March 2026

Research Letter

Mycobacterium riyadhense Pulmonary Disease after Relocation from Saudi Arabia, Japan

Takuya Ozawa, Takeshi Komine, Sohei Nakayama, Yusuke Suzuki, Naoki Hasegawa, Koichi Fukunaga, Ho Namkoong, Hanako Fukano, and Takanori AsakuraComments to Author 
Author affiliation: Keio University School of Medicine, Tokyo, Japan (T. Ozawa, N. Hasegawa, K. Fukunaga, H. Namkoong, T. Asakura); Japan Institute for Health Security, Tokyo (T. Komine, H. Fukano); Kitasato University Kitasato Institute Hospital, Tokyo (S. Nakayama, Y. Suzuki, T. Asakura); Kitasato University School of Pharmacy, Tokyo (Y. Suzuki, T. Asakura)

Main Article

Figure 1

Serial axial chest computed tomography images over time from patient with Mycobacterium riyadhense pulmonary disease after relocation from Saudi Arabia, Japan. A, B) Images taken at initial hospital visit, demonstrating multiple scattered small nodular opacities in the right upper and middle lobes (A) and the lingular segment (B), accompanied by bronchial wall thickening. C, D) Images taken 2 years later, showing progression of the lesions in the right upper/middle lobes (C) and lingular segment (D). E, F) Images taken after treatment showing improvement of the lesions in the right upper/middle lobes (E) and lingular segment (F).

Figure 1. Serial axial chest computed tomography images over time from patient with Mycobacterium riyadhense pulmonary disease after relocation from Saudi Arabia, Japan. A, B) Images taken at initial hospital visit, demonstrating multiple scattered small nodular opacities in the right upper and middle lobes (A) and the lingular segment (B), accompanied by bronchial wall thickening. C, D) Images taken 2 years later, showing progression of the lesions in the right upper/middle lobes (C) and lingular segment (D). E, F) Images taken after treatment showing improvement of the lesions in the right upper/middle lobes (E) and lingular segment (F).

Main Article

Page created: February 20, 2026
Page updated: March 20, 2026
Page reviewed: March 20, 2026
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