Diagnostic ultrasound ( PDFDrive )

776 PART III Small Parts, Carotid Artery, and Peripheral Vessel Sonography
A
B
FIG. 21.21 Cyst With Scintillating Echoes and Color Streaking. (A) This complicated cyst contains loating punctate echoes that move
posteriorly while being scanned, creating a scintillating appearance on gray-scale sonography. (B) Power Doppler ultrasound pushes the echoes
posteriorly faster and with more energy than does the gray-scale beam. The echoes move fast enough that color persistence creates the appearance
of “color streaking,” an artifact that should not be confused with blood low.
A
Supine
LT 300 3B
B
Upright
FIG. 21.22 Milk of Calcium. Milk of calcium is actually a dependent layer of tiny calculi (between arrows) within a breast cyst that moves
when the patient changes position. (A) The calculi lie along the dependent posterior wall in the supine position. (B) The calculi fall to the dependent
inferior position when the patient is in the upright position and scanned in the longitudinal plane.