[Expression of bone morphogenetic protein 2 in lung adenocarcinoma with ossification].

We report a case of primary lung cancer with ossification. A 69-year-old woman was referred to our hospital due to an abnormal shadow on a chest roentgenogram. Chest computed tomography demonstrated an irregular mass with scattered high-density areas in the left lower lung.

[Solitary fibrous tumor of the bronchus; report of a case].

A 69-year-old woman was referred to our hospital due to an abnormal shadow on a chest roentgenogram. Computed tomographic scanning revealed a complete atelectasis of the left lower lobe. Though the definitive diagnosis was not obtained preoperatively, we performed a left lower lobe excision because atelectasis existed for more than one year.

[Pulmonary actinomycosis that was difficult to make an accurate diagnosis].

A 35-year-old man was referred to our hospital, because of recurrent pneumonia. His chest X-ray film and computed tomography showed mass-like consolidation with a cavity in the right upper lobe. He underwent a bronchoscopic examination, but no diagnosis was established.

[Re-operation for relapsed thymic carcinoid; report of a case].

A 68-year-old male patient underwent extended thymectomy via median sternotomy, 4 years ago. The pathological diagnosis was thymic atypical carcinoid having invaded the pleura and vessel. During follow-up, the new nodular shadows in the anterior mediastinum were pointed out by a chest computed tomography (CT) scan, 40×38 mm and 11×10 mm in size.

Low selection of preneoplastic hepatocytes after treatment with the 2-acetylaminofluorene diet-partial hepatectomy regimen in the liver of hepatocarcinogenesis-resistant DRH strain rats.

In hepatocarcinogenesis-resistant DRH rats, preneoplastic hepatocytic lesions are smaller than those of usual rats during carcinogenesis. When preneoplastic hepatocytes from DRH and Donryu (original strain of DRH) were reciprocally transplanted into the livers of DRH and Donryu treated with 2-acetylaminofluorene (2-AAF) diet/two-thirds hepatectomy (PH), the Donryu cells formed small colonies within the DRH liver, whereas the DRH cells formed large colonies within the Donryu liver. The DRH liver showed less degree of oval cell proliferation after treatment with 2-AAF and PH, and DRH hepatocytes were more resistant to the growth-inhibitory effect of 2-AAF after PH.