Figure 1. The computed tomography of abdomen showed retroperitoneal fat protruding through Grynfeltt's triangle (bold red arrow) bound by the 12th rib superiorly (thin red arrow), the quadratus lumborum muscle medially (triangle), and internal oblique muscle laterally (asterisk). Fig. 2A. The operation demonstrated a soft, tympanic and compressible herniated sac with a smooth surface (arrows). 2B. The defect was repaired by direct apposition of the internal oblique muscle and fascia with non-absorbable sutures.