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1
Department of Radiology, University of Occupational and Environmental Health
School of Medicine, Yahatanishi-ku, Kitakyushu-shi, 807-8555 Japan.
2
Department of Pathology and Oncology, University of Occupational and
Environmental Health School of Medicine, Kitakyushu-shi, 807-8555 Japan.
3
Department of 2nd Surgery, University of Occupational and Environmental Health
School of Medicine, Kitakyushu-shi, 807-8555 Japan.
4
Department of Respiratory Disease, University of Occupational and
Environmental Health School of Medicine, Kitakyushu-shi, 807-8555 Japan.
OBJECTIVE. This study was performed to evaluate the evolution of peripheral lung adenocarcinomas using CT findings and histologic classification related to tumor doubling time.
MATERIALS AND METHODS. The subjects were 34 patients, each with an adenocarcinoma smaller than 3 cm. All patients underwent chest radiography and 10 of them had previously undergone CT more than 6 months before surgery. Tumor doubling time was estimated by examining sequential radiographs using the method originally described by Schwartz. Tumor growth was also observed by studying the changes on CT in the 10 patients who had previously undergone CT. The histologic classification (types A-F) was evaluated according to the criteria of Noguchi et al.
RESULTS. Five (83%) of the six adenocarcinomas with tumor types A or B showed localized ground-glass opacity on high-resolution CT. All six tumors had a tumor doubling time of more than 1 year. Fifteen (71%) of the 21 tumors with type C showed partial ground-glass opacity mixed with localized solid attenuation on high-resolution CT. Ten (48%) of these 21 type C tumors had a tumor doubling time of more than 1 year. In types B and C, the solid component or the development of pleural indentation and vascular convergence increased during observation before surgery. All seven tumors with types D, E, and F showed mostly solid attenuation, and the tumor doubling time was less than 1 year in six (87%) of the seven tumors.
CONCLUSION. Two main types of peripheral lung adenocarcinoma exist. The first type appears on CT as a localized ground-glass opacity with slow growth, and the other appears as a solid attenuation with rapid growth.
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