II. Definitions
- Tenosynovial Giant Cell Tumor (Nodular Tenosynovitis)
- Lobulated benign tumor that encasing finger or toe tendons, and grows slowly over the course of years
III. Findings
- Swelling overlying the tendons of the finger (most common) or toes
- Second finger is most commonly affected
IV. Labs
- Histology
- Mononuclear cells
- Multinucleated Osteoclast-like giant cells
- Hemosiderin-laden Macrophages
- Foam cells
- Inflammatory infiltrate
V. Imaging
- XRay
- May demonstrate bony erosions
-
Ultrasound
- Small growth that does not attach to tendon
- MRI
- T1 with low signal compared with Muscle
- T2 with hemosiderin deposition
VI. Management
- Surgical resection
- Recurrs in up to 15% of cases