Stepwise evaluation of liver sectors and liver segments by endoscopic ultrasound

Table 4 The structures from three positions from station 1

Clockwise rotation from an open position to left	Part of portal vein	Part of hepatic vein	Other home base structures	Main sector of liver visualized	Main segments of liver visualized	Figure number for segment
Open position to left	PII and PIII	LHV	Diaphragm and heart	Left medial closer to left lateral1	II, III, and IV	2A, 2B, 3A, 5A
Neutral position after approximately 60° to 75° clockwise rotation	Fisheye appearance of LPV	MHV	Left edge of transverse fissure attached to ligamentum venosum and ligamentum teres	Left medial closer to probe than right anterior	I and IV	3A, 5B
Open position to right after further approximately 60° to 75° clockwise rotation	RPV dividing into anterior and posterior branches	RHV	Right edge of transverse fissure, IVC, gallbladder, and caudate process	Right anterior closer to probe than right posterior	V, VI, VII, and VIII	3A, 7A 7C, 7D

¹When the scope is in maximum open position only the left lateral segment is seen. IVC: Inferior vena cava; LHV: Left hepatic vein; MHV: Middle hepatic vein; RHV: Right hepatic vein; LPV: Left branch of the portal vein; RPV: Right branch of the portal vein.