Soft tissue
Uncertain differentiation
Juxta-articular myxoma
Author: Vijay Shankar, M.D.
Last author update: 1 May 2013
Last staff update: 7 December 2020
Copyright: 2002-2023, PathologyOutlines.com, Inc.
PubMed Search: Juxta-articular myxoma
Table of Contents
Definition / general | Epidemiology | Sites | Case reports | Clinical images | Gross description | Gross images | Microscopic (histologic) description | Microscopic (histologic) imagesCite this page: Shankar V. Juxta-articular myxoma. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/jointsjuxtaarticularmyxoma.html. Accessed June 4th, 2023.
Definition / general
- Myxoid lesion arising adjacent to large joint (Hum Pathol 1992;23:639, Stanford University: Juxta-articular Myxoma)
- 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 man runner with suprapatellar symptoms (Orthopedics 2009;32:527)
- 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
Images hosted on other servers:
Arthroscopic image
of lesion within
suprapatellar pouch
Gross description
- Myxoid, mucoid or slimy mass with pale white to yellow color
Gross images
Images hosted on other servers:
Glassy appearance
Microscopic (histologic) description
- Loosely arranged spindle cells in hypovascular myxoid matrix; variable cystic spaces can be seen
Microscopic (histologic) images
Images hosted on other servers:
Myxoid stroma and spindle cells
Bland myxoid
neoplasm without
mesenchymal atypia
or hypercellularity
