CASE REPORTA 9-year-old girl presented with a history of weakness in the right upper and lower limb of 3 months duration. She was born out of non-consanguinous marriage and full term normal delivery. Her developmental milestones were normal. She was 132.5 cms tall and weighed 25 kgs. Physical examination revealed ptosis and miosis in the left eye suggesting horner's syndrome. She had decreased power, 3/5 in right upper limb and 4/5 in right lower limb. Her reflexes were brisk in bilateral upper and lower limbs. She had horizontal nystagmus in both eyes and mild sensorineural deafness. Airway examination revealed prominent teeth, neck tilt to right side and congestion of posterior pharyngeal wall.The MRI brain study revealed left vestibular and trigeminal nerve schwannomas and a posterior petrous meningioma on the right side [Table/ Fig-1]. The spine MRI study showed intradural extramedullary lesions at C1-C2, C7, D1-D3 levels and multiple tiny lesions in the region of filum terminale [Table/ Fig-2]. The dorsal lesions were seen extending to posterior mediastinum. The chest radiograph showed tumours occupying both the apices of the lungs, and on right side the lesion had extended to midzone as well [ The patient was scheduled for decompression of the cervicodorsal lesions and excision of the right intrathoracic lesion. ECG, NIBP, ETCO 2 , nasopharyngeal temperature, Entropy, urine output were monitored. The girl was induced with propofol followed by videolaryngoscopy to see if any lesions were present in the larynx complicating intubation. As no abnormalities were detected, the child was intubated with 6.0 mm size cuffed oral endotracheal tube which was facilitated with vecuronium. Invasive monitors used were right radial artery and left jugular venous pressures. Anaesthesia was maintained with O 2 , N 2 O and isoflurane. Analgesia was achieved with intermittent doses of Morphine. Due to massive blood loss estimating to about 2000ml, only cervical tumour was excised and further tumour excision was scheduled later. Intra-operative blood loss was replaced with packed red blood cells and fresh frozen plasma. The vitals were maintained within 20% of the base line values. Post-operatively, the child was extubated and monitored in PICU for two days. A month later, this girl was scheduled for excision of dorsal tumor and its right throracic extension. As proper size double lumen tube was not available for single lung ventilation for thoracic tumour exision, the child was intubated with single lumen 6.0 mm cuffed endotracheal tube. Intraoperatively invasive monitors were initiated and dorsal tumor exision was performed uneventfully. She was positioned in left lateral decubitus position with proper padding to avoid injury to axillary neurovascular bundle. The child was ventilated using air-oxygen mixture and isoflurane with small tidal volumes of 100 -125 ml and respiratory rate of 30-35 min with a PEEP of 4 mm Hg. The EtCO 2 and oxygen saturations were maintained between 35-40 mmHg and above 97% respectively. The arteria...