General anaesthesia was pre‐administered by subcutaneous injection of 0.04 mg/kg atropine sulphate (Mitsubishi Tanabe Pharma Co., Osaka, Japan), followed by intravenous injection of 0.1 mg/kg midazolam (Dormicum; Astellas Pharma Inc., Tokyo, Japan) and 0.1 ml/kg fentanyl citrate‒droperidol (Thalamonal; Daiichi‐Sankyo Propharma Co., Ltd., Tokyo, Japan). General anaesthesia was induced using propofol (Mylan; Mylan Seiyaku Ltd., Tokyo, Japan). Endotracheal intubation was subsequently performed. Each dog was mechanically ventilated with 2.0%–2.5% isoflurane (IsoFlo; Zoetis Japan, Tokyo, Japan) and oxygen. For analgesia, intra‐ and post‐operative continuous drip infusions of remifentanil (5–40 μg/kg/h) (Ultiva; Janssen Pharmaceutical K.K., Tokyo, Japan) and pre‐ and post‐operative intramuscular injections of morphine hydrochloride (0.3 mg/kg each dose) (Takeda Pharmaceutical Co. Ltd. Osaka, Japan) were used.
Prior to surgery, CT was performed, and the volume (cm3) of the lung mass was measured in terms of length, width, and height. All patients were approached through an intercostal or median sternotomy depending on the region and size of the individual tumours, and the tumours were resected by lung lobectomy. All resected masses were weighed.
Prior to surgery, CT was performed, and the volume (cm3) of the lung mass was measured in terms of length, width, and height. All patients were approached through an intercostal or median sternotomy depending on the region and size of the individual tumours, and the tumours were resected by lung lobectomy. All resected masses were weighed.