Other Tumor like lesion
- It is most common soft tissue tumors (swelling) of hand & wrist. It arises from leakage of synovial fluid from a joint or tendon sheath.
- It is a unilocular cystic structure filled with mucinous fluid but without a synovial or epithelial lining. In most cases, stalk can be identified, communicating between the cyst and adjacent joint or tendon sheath.
- It usually develops on dorsal surface of scapho lunate ligament. Back of wrist is the commonest site
- The three most common location of ganglion are dorsal wrist (from scapholunate joint), > palmar wrist (radioscaphoid or scaphotrapezial joint), digital flexor sheath and distal interphalangeal joint.
- Compound palmar ganglion is neither ganglion nor compound and is d/t chronic inflammation of common sheath of flexor tendon both above and below flexor retinaculum causing hour glass swelling. RA and tuberculosis are the commonest cause.
- Developmental abnormality
- F > M all age
- Proximal femur > Ribs > maxilla
- Associated with McCune Albright syndrome, Mazabraud syndrome
- 1% risk malignant transformation
- Histology: alphabets soup/ Chinese letter
- X-ray: Shepherds crook deformity, Ground glass appearance.