To clarify the anatomy of the peritoneal reflections of the left perihepatic region, the authors examined 95 cadavers. Thirty-eight were studied radiographieally, 37 with sagittal dissection, and 2O with transverse dissection. In over 80% of the cadavers, the left triangular ligament of the liver separated the left suprahepatic-space into anterior and posterior selions. The lesser omentum extended to the diaphragm, where its anterior layer reflected and continued as the posterior layer of the left triangular ligament. Thus, the posterior left suprahepatic space and the lesser sac were clearly separated by the lesser omentum and the stomach and overlapped each other in three dimensions. The posterior left suprahepatic-space was located anterosuperior to the lesser sac and in turn was continuous with the gastrohepatic space inferfurly. Carefully researched diagrams of both the mldline sagittal and left parasagittal perihepatic spaces were developed. This informarion has clinical value when the radiologist is called on to drain a left perthepatic abscess.