The inquest into the death of Richard Connolly, of 101 Feale Drive, Listowel, was told he was born with the malformation, but he or his family would not have been aware of that.
Assistant State Pathologist Dr Margaret Bolster, who carried out a post-mortem examination, said the malformation of the vessels would have grown larger and larger over the years before rupturing and causing the inter-cerebral haemorrhage which led to his death.
His mother, Mary Relihan, told how she had driven the teenager to various engagements on the afternoon of April 13, 2006, a week after his 15th birthday.
She said they had called to a house to find out the time of a football match in which he was playing. Shortly after they had returned home, he complained of a headache and became agitated and began roaring with pain.
Ms Relihan, who was in distress as her deposition was being read out, gave him two painkillers. However, he began losing his sight, his speech became incoherent and he was not making sense. She and her partner, Michael Connolly, rushed him to Kerry General Hospital where he was placed on life support and he died on April 18 when the support was switched off.
Dr Bolster assured Ms Relihan he would have felt nothing once he had lost consciousness.
Coroner Helen Lucey extended her deepest sympathy to the family. She suggested some comfort could be taken from the fact he knew nothing beyond the headache.
The jury returned a verdict in accordance with the medical evidence.
Inspector Martin Mc Carthy, the jury forewoman and medical personnel also offered their sympathy.