To the Editors, We have read with great interest the article by Jeewa and colleagues published in Pediatric Cardiology describing two cases of coronary arteriovenous fistula [1]. The authors reported that the dilated left coronary artery communicated directly with the coronary sinus. The abnormal vessel ran along the atrioventricular groove and entered into the right atrium through a restrictive Thebesian valve. The morphology and location of this dilated vessel suggested the direct connection of the proximal circumflex artery to the coronary sinus. We recently experienced a case quite similar to these cases. A 12-year-old girl was referred to our hospital for a continuous murmur. The echocardiography had shown an appearance similar to that of the reported cases. The aortography also showed that the dilated left circumflex artery appeared to connect with the enlarged coronary sinus (Fig. 1a, b). However, the multidetector-row computed tomography (MDCT) images showed that the coronary sinus was present next to this abnormal vessel (Fig. 1c, d). This dilated vessel originated from left coronary artery and drained directly to the right atrium. We considered that this abnormal vessel could not be the coronary sinus in either our case or Jeewa’s cases. If the vessel was the coronary sinus, the coronary perfusion would not be workable because the blood pressure in the coronary sinus can be much higher than in the peripheral coronary arterial branches. It was quite difficult to distinguish the coronary sinus from the abnormal dilated vessel draining into the right atrium using echocardiography or conventional angiography. Although fistulas between the circumflex coronary artery and the coronary sinus are rare [2], it is quite important and essential to make a precise diagnosis. In these cases, MDCT is a promising tool for precise depiction and determination of the optimal treatment.
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