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Sonographic Detection of Baker's Cysts

Comparison with MR Imaging

¹ Department of Radiology, Henry Ford Hospital, 2799 W. Grand Blvd., Detroit, MI 48202.
² Department of Radiology, University of Michigan Medical Center, 1500 E. Medical Center Dr., TC-2910G, Ann Arbor, MI 48109-0326.

View larger version (143K): [in a new window]   Fig. 1. —25-year-old asymptomatic man. Axial sonogram shows semimembranosus tendon (solid arrow) and medial gastrocnemius tendon (open arrow) with no intervening fluid. Semimembranosus tendon appears artifactually hypoechoic because of anisotropy (normal hyperechoic tendon appears hypoechoic if tendon is not perpendicular to the ultrasound beam). Note that top of image is posterior; left side of image is medial. M = medial gastrocnemius muscle, F = femur.

View larger version (98K): [in a new window]   Fig. 2A. —60-year-old woman with Baker's cyst. Axial sonogram of posterior knee shows Baker's cyst (arrowheads) with fluid (solid straight arrow) between semimembranosus tendon (curved arrow) and medial gastrocnemius tendon (open arrow). Note subgastrocnemius component (asterisk) of Baker's cyst. Note that top of image is posterior; right side of image is medial. M = medial gastrocnemius muscle.

View larger version (135K): [in a new window]   Fig. 2B. —60-year-old woman with Baker's cyst. Axial proton density-weighted MR image with fat saturation reveals Baker's cyst (arrowheads) with fluid (black arrow) between semimembranosus tendon (curved white arrow) and medial gastrocnemius tendon (open arrow). Note subgastrocnemius component (asterisk) of Baker's cyst. M = medial gastrocnemius muscle.

View larger version (141K): [in a new window]   Fig. 3A. —15-year-old boy with Baker's cyst. Sagittal sonogram of posterior knee shows Baker's cyst (arrowheads). Note septation (solid arrow). Note that top of image is posterior; left side of image is superior. Open arrows = medial gastrocnemius tendon, T = tibia.

View larger version (169K): [in a new window]   Fig. 3B. —15-year-old boy with Baker's cyst. Sagittal proton density-weighted MR image reveals Baker's cyst (arrowheads). Note septation (solid arrow). Open arrows = medial gastrocnemius tendon.

View larger version (151K): [in a new window]   Fig. 4A. —62-year-old man with rupture of Baker's cyst. Sagittal sonogram of posterior knee shows irregular hypoechogenicity (arrows) surrounding the inferior border of Baker's cyst (arrowheads). Note that top of image is posterior; left side of image is superior. M = medial gastrocnemius muscle.

View larger version (100K): [in a new window]   Fig. 4B. —62-year-old man with rupture of Baker's cyst. Coronal proton density-weighted MR image with fat saturation reveals high-signal-intensity fluid (arrows) extending inferiorly from Baker's cyst (arrowheads).

View larger version (150K): [in a new window]   Fig. 5A. —38-year-old woman with intraarticular body in Baker's cyst. Axial sonogram shows echogenic intraarticular body (arrow) in Baker's cyst (arrowheads). Note that top of image is posterior.

View larger version (174K): [in a new window]   Fig. 5B. —38-year-old woman with intraarticular body in Baker's cyst. Sagittal proton density-weighted MR image reveals intermediate signal intraarticular body (arrow) in Baker's cyst (arrowheads).

View larger version (146K): [in a new window]   Fig. 6A. —39-year-old man with myxoid liposarcoma. Axial sonogram shows relatively hypoechoic and septate cystic mass (arrowheads). Note that top of image is posterior; left side of image is lateral. F = femur, TV = transverse.

View larger version (146K): [in a new window]   Fig. 6B. —39-year-old man with myxoid liposarcoma. Axial T1-weighted MR image reveals heterogeneous, predominately intermediate-signal-intensity myxoid liposarcoma (arrowheads).

View larger version (125K): [in a new window]   Fig. 6C. —39-year-old man with myxoid liposarcoma. Axial proton density-weighted MR image with fat saturation reveals predominately high-signal-intensity mass (arrowheads). Note lack of extension between semimembranosus tendon (solid arrow) and medial gastrocnemius tendon (open arrow).

View larger version (122K): [in a new window]   Fig. 7A. —13-year-old girl with meniscal cyst. Sagittal sonogram shows hypoechoic meniscal cyst (curved arrow) in contact with hyperechoic meniscus (open arrows) and hypoechoic meniscal tear (solid straight arrows). Note that top of image is posterior; left side of image is superior. F = femur, c = hyaline cartilage.

View larger version (160K): [in a new window]   Fig. 7B. —13-year-old girl with meniscal cyst. Sagittal proton density-weighted MR image reveals meniscal cyst (curved arrow) in continuity with meniscal tear (straight arrow).

View larger version (144K): [in a new window]   Fig. 7C. —13-year-old girl with meniscal cyst. Axial proton density-weighted MR image with fat saturation reveals meniscal cyst (curved arrow) with signal intensity of fluid without extension between semimembranosus tendon (undulating arrow) and medial gastrocnemius tendon (arrowhead).

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