Presentation
Moderate pain and a palpable mass at the dorsoradial aspect of the proximal phalanx of the thumb.
Patient Data
There is an exophytic cortical-based mass at the dorsoradial aspect of the proximal phalanx of the thumb. The lesion demonstrates a high T2 signal and intermediate T1 signal. A string-like isointense connection to physis is present. In addition, there is a small cortical defect with inflammatory changes of the adjacent soft tissue.
Exophytic mass at the dorsoradial aspect of proximal phalanx D1 with a small cortical defect.
Intraoperative photo. Cortical defect can be seen.
Postoperative. Exophytic mass was resected. No bone grafting.
Pathologist report:
1.2 x 0.6 cm bony specimen. Microscopy shows hyaline cartilage with isomorphic chondrocytes, surrounded by regular cancellous bone tissue.
Conclusion: Ecchondroma. No sign of malignancy.
Case Discussion
This is a case is of histologically proven enchondroma protuberans.
A cartilaginous connection between enchondroma and growth plate is recognizable.