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In the staging of nonsmall cell carcinoma of the lung, which of the following are true?
a) Ipsilateral hilar lymph node involvement is a contraindication to surgery
b) Malignant effusion contraindicates curative resection
c) Involvement of the pericardium indicates unresectability
d) Rib invasion is a contraindication to surgery
e) Tumour involvement of the main pulmonary veins indicates T4 disease

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