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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 6 The Biliary Tree and Gallbladder 197

TABLE 6.1 Acute Calculous Cholecystitis: Pathologic-Sonographic Correlation

Pathophysiology

Obstruction of cystic duct or neck of gallbladder

Continued secretions

Inlammatory cell iniltration

and

Gallbladder wall edema

Hypervascularity

Gallbladder stasis with bacterial overgrowth by 72 hours

Empyema of gallbladder

Increased pressure in gallbladder lumen and wall

Gangrene

Perforation

Sonographic Appearance

Stones in gallbladder, possibly in neck or cystic duct

Gallbladder distention

Thickening of gallbladder wall

Gallbladder wall often striated with pockets of edema luid

Positive sonographic Murphy sign (>90%)

Hyperemia of gallbladder wall

Biliary sludge

Heterogeneous luminal contents of variable echogenicity with

layering

Sloughed membranes; hypovascularity

Loss of Murphy sign

Loss of gourd shape; collection in or adjacent to gallbladder fossa

A

B

C

D

FIG. 6.39 Acute Cholecystitis. Classic acute cholecystitis in a young man. (A) Sagittal images show a tense distended gallbladder, wall thickening,

luid-debris level, and a nonobstructive stone with posterior acoustic shadowing. (B) Further scrutiny of the distended cystic duct reveals the

obstructive stone (arrow). (C) Transverse image through the gallbladder shows the gallbladder forming a near perfect circle, due to internal increased

pressure. (D) Sagittal Doppler image shows a prominent cystic artery and hyperemia in the wall of the gallbladder as well as the adjacent liver.

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