Seroma following modified Blalock-Taussig shunt resulting in subsequent occlusion of the shunt which was opened by balloon angioplasty.

We report the case of a 9-year-old boy with tetralogy of Fallot who had undergone left modified Blalock Taussig shunt. The patient developed seroma around the shunt which was excised surgically. The patient developed total occlusion of the shunt post-operatively with clinical deterioration. We used emergency percutaneous angioplasty to successfully treat the patient.