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Ann Thorac Surg 2002;73:386-392
© 2002 The Society of Thoracic Surgeons
a Departments of Thoracic Surgery, Diagnostic Radiology, Field Research and Internal Medicine, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
Accepted for publication October 16, 2001.
* Address correspondence to Dr Kodama, Department of Thoracic Surgery, Osaka Medical Center For Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan
e-mail: kdm{at}ma2.justnet.ne.jp
Background. Pure ground-glass opacity (PGGO) is a new entity that has been clearly defined on high-resolution computed tomography (CT) during the last half decade. It is important to investigate the natural history of PGGO through long-term observation for the management of this new entity.
Methods. We investigated 19 patients with PGGO(s) defined on high-resolution computed tomography and retained as PGGO for more than 2 years. The PGGOs of 11 patients were detected at annual mass screening by low-radiation–dose CT (low-dose CT), 7 at follow-up CT after cancer resection, and 1 incidentally on CT. After long-term observation, 10 of 19 patients underwent operation and 9 are currently being followed-up with CT. Their growth characteristics and histologic findings are reported.
Results. The median follow-up period was 32 months, ranging from 24 to 124 months. The sizes of PGGOs at the time of discovery were 4 to 18 mm in largest diameter (average 8.6 mm). During follow-up, the size of PGGO showed no change in 8 patients, increased slightly (up to 5 mm) in 6 patients, and increased by more than 5 mm in 5 patients. Ten patients had limited resection (segmentectomy or wide wedge resection) with negative surgical margin by intraoperative lavage cytology of the resection margin of the lung. Of them, 5 patients had adenocarcinoma, 3 pulmonary lymphoproliferative disorder, and 1 each atypical adenomatous hyperplasia and focal fibrosis. There was no clear tendency between the degree of size change and histology. In all but 1 of 9 patients with follow-up only, the PGGOs showed either no change or only a slight increase within 5 mm in largest diameter.
Conclusions. These data suggest that some PGGOs will never progress to clinical disease and would be included in the category of overdiagnosis bias. However, a prior history of lung cancer should significantly raise the index of suspicion, as 4 of 5 proven cancer cases in this small series fell into that category. Because of the difficulties of preoperative and intraoperative histodiagnosis of PGGO, minimally invasive surgery may be appropriate from the viewpoints of both diagnosis and curability.
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