A case of massive hemothorax developing a few minutes after removal of a central venous catheter is described in a 51-yr-old woman, who had undergone a renal transplant. The patient had an arteriovenous fistula for hemodialysis on the same side as the central catheter. The mechanism of the onset of this complication is discussed. We recommend avoiding positioning a central catheter on the same side as an arm arteriovenous fistula. Furthermore, we think it is necessary to monitor patients after removal, as is usually done after positioning, to detect this potentially fatal complication.