Ectopic and Accessory Gallbladders

A communication between the bile ducts of the right lobe and the gallbladder exists during fetal development. When it persists into adulthood, this cystohepatic duct of Luschka (Fig. 2-27) may be severed during a cholecystectomy, resulting in a bile leak.44,45 Other anomalies that may involve the gallbladder include a "wandering gallbladder" in which an elongated suspending mesentery allows marked mobility of the gallbladder46-48 (Fig. 2-28). When the more caudal of the biliary buds from the foregut does not fully separate from the cranial, the gallbladder may actually develop within the liver paren-chyma46,49-51 (Fig. 2-29). Duplication and triplication of the gallbladder, with or without a separate cystic duct, may also occur due to abnormal branching of the fore-

Agenesis Right Lobe Liver

Fig. 2-26. Agenesis of right hepatic lobe.

Postcontrast CT scan shows nearly complete agenesis of the right hepatic lobe, of which only a rudimentary portion (r) is present lateral to the gallbladder (g). The hypertrophied left lobe accounts for the vast majority of liver tissue. Note the fissure of the ligamentum teres (arrow) between the lateral (L) and medial (M) segments of the left hepatic lobe, which is diffusely infiltrated with fat.

Fig. 2-26. Agenesis of right hepatic lobe.

Postcontrast CT scan shows nearly complete agenesis of the right hepatic lobe, of which only a rudimentary portion (r) is present lateral to the gallbladder (g). The hypertrophied left lobe accounts for the vast majority of liver tissue. Note the fissure of the ligamentum teres (arrow) between the lateral (L) and medial (M) segments of the left hepatic lobe, which is diffusely infiltrated with fat.

gut buds52-54 (Figs, 2-30 and 2-31). Faulty recanalization of the biliary bud may also lead to agenesis of the gallbladder associated with other congenital anoma-

lies.46,50,55,56

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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