Desmoid tumour in thoracotomy scar 5 years after excision of a left giant atrial appendage aneurysm in female with a family history of Gardner's syndrome.

A very large desmoid tumour extensively involving the chest wall and the left anterior abdominal wall is described in a patient with a family history of Gardner's syndrome. The desmoid arose at the site of a thoracotomy scar due to the removal of a large aneurysm of the left atrial appendage five years before. Both a plastic surgeon and a thoracic surgeon were required to remove the tumour. Aneurysmal dilatation of the left atrium is extremely rare and has not been reported in association with Gardner's syndrome before.