Further updates issued on Sunday afternoon:

From Iodaracing: 'Alex De Angelis, rider for the Team e-motion Iodaracing MotoGP, following the tremendous fall in FP4 GP of Japan, is still hospitalized in the intensive care unit of Dokkyo University Hospital located in Tochigi prefecture.

'De Angelis conditions are stable. The rider reported a sharp fall in head injury with loss of consciousness in addition to minor fractures of five vertebrae without spinal involvement, bilateral fracture of two ribs and a light fracture of the sternum and the left collarbone. The tests that were carried out during these hours at the intensive care unit of Dokkyo Hospital showed no lesions of the internal organs, but there remains a pulmonary contusion due to the strong impact suffered by the San Marino rider.

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'An MRI performed in the morning today showed a slight intracranial bleeding which is currently not of concern but that is kept under close observation by the Japanese medical staff. The bleeding was not showed in the yesterday's tests, but is part of the consequences of massive head trauma that Alex has suffered as a result of the fall. A neurosurgeon will visit the rider in the evening today (Japan time).

'The rider who arrived at the hospital in helicopter, is sedated and breathing on his own. Sedation was properly prepared by the medical staff to relieve the pain of fractures and trauma to De Angelis.

'At this time Alex De Angelis was never left alone. The owner of the team e-motion Iodaracing, Giampiero Sacchi, was with him at all times and will continue to assist him in these days together. MD. Michele Zasa from Mobile Clinic will join Sacchi in the course of stay in Japan by Alex De Angelis.

'The e-motion Iodaracing Team would like to thank the staff of the Clinica Mobile, Dorna for the help they are giving to De Angelis and Team, in addition to precious availability of Mr. Toshi Obara who helped everyone as translator between the medical staff and the team.

'Staff Team and-motion Iodaracing is in constant contact with the family of Alex De Angelis and is organizing the transfer of his family in Japan.

'More information about the clinical condition of Alex De Angelis will be circulated as soon as available.

From Dorna: 'MotoGP rider Alex De Angelis underwent further medical checks this morning at Dokkyo Medical University Hospital.

An MRI was performed, showing an intracranial bleeding. However, the entity of this bleeding has to be better evaluated, and the rider will undergo a neurosurgical evaluation later on this evening.

Dr. Michele Zasa from Clinica Mobile is going to stay with the rider for the next few days, in order to follow the clinical evolution of the patient.'

MotoGP medical director Michele Macchiagodena has confirmed the full extent of the serious injuries suffered by Alex de Angelis during fourth free practice for the Japanese Grand Prix, which includes multiple rib and vertebrae fractures, as well as a lung contusion.

The Sammarinese received lengthy medical treatment at the side of the Motegi circuit following the fall from his Ioda machine, with the team later confirming 'numerous fractures'. It also said he was conscious and talking as he was extricated.

Airlifted to Dokkyo Hospital in Mibu for treatment, de Angelis has undergone a CT scan, which has diagnosed a lung contusion after preliminary analysis. Furthermore, he is confirmed with several rib fractures, fractures to his T7-T8-T9 vertebrae, a body fracture to L4 and trasversal process fractures to T2, T4 and T8.

Also suffering a head concussion, the Macchiagodena says he will need to closely observed in the coming days to ensure his condition remains stable.

"There's a thoracic trauma with bilateral ribs fracture, on the left and the right. He also suffered a head concussion - the CT scan doesn't demonstrate any damage or bleeding but it still requires to remain under observation for the next days. However what needs more attention is the fact he sustained a lung contusion - we'll have to monitor it closely to make sure it doesn't lead to restricted breathing or any kind of infection.

"The early checks also report 5 fractured vertebrae, from which three seem to affect the body of the vertebrae - as of now there's no neurological damage but we'll have to make sure those fractures are stable so the medulla isn't affected. For now it needs to be observed closely in order to determine if surgery can be avoided."