[A case of lung cancer mimicking rupture of a thoracic aortic aneurysm].

A 56-year-old man visited another hospital complaining of hemoptysis. A chest radiograph showed expansion of the left upper mediastinum which seemed to be a mass-like lesion. He was referred to our hospital for further investigations.

[A case of MPO-ANCA positive vasculitis associated with multiple pulmonary nodules following propylthiouracil treatment].

A 34-year-old woman who had been treated with propylthiouracil (PTU) for hyperthyroidism, was admitted because of bloody sputum and pyrexia. The chest CT scan showed some nodules in both lung fields. The serum level of myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA) was high, but proteinase-3 antineutrophil cytoplasmic antibody (PR-3 ANCA) was negative.

[A case of posterior mediastinal mature teratoma].

The chest radiograph of a 57-year-old man, complaining of paroxysmal dyspnea, suggested the probably of a tumor. Chest CT showed a tumor containing calcification, behind the left crus of the diaphragm. Chest MRI suggested lipid components and a cystic lesion within the tumor.

[A case of occult thyroid cancer detected as a solitary nodular lung metastasis].

An 82-year-old woman was admitted to our hospital with cough and back pain. A chest radiograph showed a solitary nodular lesion in the right lower lung field. It was diagnosed by a transbronchial biopsy as lung metastasis of a papillary adenocarcinoma of the thyroid.

[A case of AIDS-complicated lung infection mimicking acute eosinophilic pneumonia].

A 34-year-old man was admitted with dyspnea and low grade fever. Chest radiograph and computed tomography (CT) showed bilateral, ground glass opacities and perihilar consolidation. Bronchoalveolar lavage (BAL) was performed.