[Chronic and acute hypersensitivity pneumonitis in a dairy farmer and his son].

We encountered a dairy farmer and his son with farmer's lung who had worked on the same farm for 25 years and 5 years, respectively. The son was admitted to our hospital because of cough, sputum, and shortness of breath. Chest computed tomography (CT) on admission revealed diffuse ground-glass opacities in both lung fields.

[Autopsy case of von Recklinghausen's disease associated with lung cancer, gastrointestinal stromal tumor of the stomach, and duodenal carcinoid tumor].

A 58-year-old man with von Recklinghausen's disease was admitted for further investigation of right chest pain. Chest X-ray revealed multiple emphysematous bullae in both lungs and a tumor shadow in the right upper lobe. Bronchofiberscopy was performed, but an adequate specimen was not obtained.

[A case of pulmonary MALT lymphoma with 6-year natural history].

A 58-year-old asymptomatic man was referred for investigation of an abnormal shadow on chest X-ray films. Chest computed tomography (CT) revealed an infiltrative shadow containing an air-bronchogram. Video-assisted thoracic surgery was performed for a lung biopsy of an abnormal region in the right upper lobe of the lung.

157-nm coherent light source as an inspection tool for F(2) laser lithography.

We have developed a 157-nm coherent light source by two-photon resonant four-wave mixing in Xe, with two tunable single-mode 1-kHz Ti:sapphire laser systems at 768 and 681 nm. This light source has been developed to determine the instrumental function of a vacuum ultraviolet spectrometer and to evaluate optical designs for ultra-line-narrowed F(2) laser lithography. The spectral linewidth of the source was less than 0.