General
=========================================================================

• Myxoid lesion arising adjacent to large joint (Hum Pathol 1992;23:639, Stanford University)
• Often associated with cystic changes resembling ganglion cyst
• Often recurs, up to 4 times

Epidemiology
=========================================================================

• Median age 43 years, range 16-83 years
• 72% male

Sites
=========================================================================

• Knee (88%), also shoulder, elbow, ankle, hip

Case reports
=========================================================================

• 5 year old boy with palpable mass on medial side of knee proximal to knee joint (Eur Radiol 2010;20:764)
• 63 year old male runner with suprapatellar symptoms (Orthopedics 2009;32:527, free full text)
• 68 year old athletic woman with several month history of progressing pain, swelling, and loss of motion in knee (Arthroscopy 2003;19:E6)

Clinical images
=========================================================================

Arthroscopic image of lesion within suprapatellar pouch

Gross description
=========================================================================

• Myxoid, mucoid or slimy mass with pale white to yellow color

Gross images
=========================================================================

Glassy appearance

Micro description
=========================================================================

• Loosely arranged spindle cells in hypovascular myxoid matrix; variable cystic spaces can be seen

Micro images
=========================================================================

Myxoid stroma and spindle cells

Knee joint

Bland myxoid neoplasm without
mesenchymal atypia or hypercellularity

This information is intended for physicians and related personnel, who understand that medical information is often imperfect, and must be interpreted in the context of a patient's clinical data using reasonable medical judgment. This website should not be used as a substitute for the advice of a licensed physician.

All information on this website is protected by copyright of PathologyOutlines.com, Inc. Information from third parties may also be protected by copyright. Please contact us at copyrightPathOut@gmail.com with any questions (click here for other contact information).