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Right-sided ligamentum teres (RSLT) is a rare congenital anomaly in which the fetal umbilical vein is connected to the right paramedian trunk. It was first described as left-sided gallbladder (LSGB) by Hochstetter et al. 1 This anomaly was initially thought to involve displacement of the gallbladder to the left side of the ligamentum teres (LT), but in 1997, Nagai et al 2 reported that LSGB resulted from anomalous attachment of the LT to the right paramedian trunk. Confusion regarding this anatomy persists due to the thought that the gallbladder position changed in patients with RSLT. A previous report proposed that LSGB occurred owing to ectopic gallbladder attachment to the left lobe of the liver, 3 whereas others suggested that sinistroposition of the gallbladder occurred due to developmental failure of the quadrate lobe. 4 The origin of this anomaly has not been fully explained but confusion has increased with a report of rightsided gallbladder in patients with RSLT. 5 Although we are likely to encounter patients with RSLT because it has an estimated prevalence of around 1%,