title: The diagnostic value of indeterminate lung lesions on staging chest computed tomographies in patients with colorectal cancer.
abstract: BACKGROUND
  Selection of pulmonary staging modality in colorectal cancer surgery is controversial. Computed tomography (CT) clearly outperforms x-ray in terms of sensitivity, but findings of indeterminate lung lesions remain a problem. The aim of the present study was to evaluate the significance of such indeterminate lung findings in staging CT scans.
  
  
  METHODS
  The study comprises a retrospective analysis of 131 consecutive patients who underwent colorectal cancer surgery in 2004. A preoperative staging CT scan of the chest and abdomen was performed in all patients. Twenty-six patients (20%) had indeterminate lung findings. Four died postoperatively. The remaining 22 were followed for a median period of 26 months.
  
  
  RESULTS
  In eight of the 22 patients (36%) lesions progressed. In one patient, the lesion turned out to be a primary lung cancer, in another a lymphoma. In the last six patients (27%), the lesions developed into colorectal cancer lung metastases within a median period of 15 months. These results were significantly different from those obtained in patients who had a normal CT, among whom only 6% developed lung malignancies in the follow-up period (p < 0.0001). The development of lung metastases was significantly related to positive nodal status at operation and elevated carcinoembryonic antigen (CEA) level at follow-up (p < 0.05).
  
  
  CONCLUSIONS
  Approximately one quarter of the indeterminate lung lesions found on staging CT in colorectal cancer patients developed into metastases and one tenth into other lung malignancies, which were most often diagnosed in the second year after surgery. The development of lung metastases was significantly related to positive nodal disease and postoperative CEA elevation.
authors.affiliation: Department of Surgery, Hillerød University, Roskilde University Hospital, DK-4000 Roskilde, Denmark.
authors.forename: Mette Williaume
authors.initials: MW
authors.lastname: Christoffersen
authors.forename: Orhan
authors.initials: O
authors.lastname: Bulut
authors.forename: Per
authors.initials: P
authors.lastname: Jess
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000473:pathology* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012189:Retrospective Studies; D021701:Sentinel Lymph Node Biopsy; D014057:Tomography, X-Ray Computed