Ebstein's heart malformation is well known in medical literature. According to Taussig1the essential feature of this disease is the downward displacement of the tricuspid valve into the right ventricle. The tricuspid valve, instead of arising from the annulus fibrosus cordis, which separates the right auricle from the right ventricle, arises in part from the ring and in part from the wall of the right ventricle. In some instances this deformity is accompanied by either a patent foramen ovale or an auricular septal defect. In this condition cardiac arrhythmias are common, and cyanosis may be present if a septal defect is present. This case is reported because a typical Ebstein's deformity was present with a large patent foramen ovale. The patient had a solitary brain abscess with persistently negative spinal fluid and blood cultures. The cardiac arrhythmia present showed the pattern of a short P-R interval with a wide