Vascular rings which can cause symptoms related the trachea and esophagus compression occur in less than 1% of all cardiovascular malformations. Double incomplete aortic arch with right-sided aorta and aberrant left subclavian artery is the rarest one, and its present in 0.04–0.1% of autopsy series. A case of this malformation with a Kommerell's Diverticulum is presented. This diverticulum has risk of severe complications such as dissection and/or rupture.
Los anillos vasculares pueden causar síntomas relacionados a compresión de tráquea y esófago y ocurren en menos del 1% de todas las malformaciones cardiovasculares. El doble arco aórtico incompleto con arco aórtico a la derecha y arteria subclavia izquierda aberrante es la forma más rara y se presenta en el 0.04 a 0.1% de las series de autopsia. Se presenta un caso de esta malformación con un divertículo de Kommerell. El divertículo tiene riesgo de complicaciones severas como disección y/o ruptura.
Vascular rings which can cause symptoms related the trachea and esophagus compression occur in less than 1% of all cardiovascular malformations1 and usually associates with others left sided ones, highlighting the importance of a comprehensive approach of the heart and the vascular structures in the same study, such as CMR to plan the surgical approach.1 Double incomplete aortic arch (DIAoA) with right-sided aorta (RSAoA) and aberrant left subclavian artery (ALSA) is the rarest one, and its present in 0.04–0.1% of autopsy series.2
We present a case of a one-year-old boy with chronic cough and difficulty for the feeding progression process, an out-site barium's swallow reported extrinsic compression of the esophagus. Due to radiation-safety concerns, a CMR was performed; a DIAoA with RSAoA and a Kommerell's Diverticulum (KD) were seen, which showed compression of the trachea and the esophagus by vascular structures. ALSA originates from the incomplete left aortic arch.
The RSAoA develops when the fourth left aortic arch involute and the right one persists.3,4 When an ALSA exists, it can create an aneurysmatic vascular dilatation, known as KD, which can be concomitant to the double aortic arch (DAA).2 The KD represents the persistency of the distal segment of DAA, generally the left one which proximal segment is atretic or disappears.1 There are three KD types described, the second one is the rarest one and it forms when the KD coexists with RSAoA and ALSA (Figs. 1 and 2).3–6
CMR of the aorta. SSFP fixed cine image axial view at aortic arch level and just distal (A) shown a double incomplete aortic arch with right-sided aorta and a KD (B). An axial T2-W image showed compression of the trachea (T) and the esophagus (E) by vascular structures (C). CMR, cardiac magnetic resonance; SSFP, steady state free precession; T2-W, T2-weighted; CE-MRA, contrast-enhanced magnetic resonance angiography; MIP, maximum intensity projection; 3D VR, 3-dimensional volume rendering; Ao, aorta; DIAoA, double incomplete aortic arch; RSAoA, right sided aortic arch; ALSA, aberrant left subclavian artery; KD, Kommerell's Diverticulum.
CMR of the aorta. ALSA originates from the incomplete left aortic arch as shown in the CE-MRA on MIP (A) and 3D VR reconstructions (B). The KD originating from the descending aorta is shown in (B). A coronal SSFP view shows “V” shape of the double incomplete aortic arch (C). CMR, cardiac magnetic resonance; SSFP, steady state free precession; T2-W, T2-weighted; CE-MRA, contrast-enhanced magnetic resonance angiography; MIP, maximum intensity projection; 3D VR, 3-dimensional volume rendering; Ao, aorta; DIAoA, double incomplete aortic arch; RSAoA, right sided aortic arch; ALSA, aberrant left subclavian artery; KD, Kommerell's Diverticulum.
The KD has risk of severe complications such as dissection and/or rupture.7
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Conflict of interestThe authors declare no conflict of interest.