Abstract: Rationale: Fibroma of tendon sheath is a rare benign tumor that is attached to the tendon sheath.
Patient concerns: A 16-year-old boy presented with a painless mass in his right foot, which was initially misdiagnosed as a giant cell tumor of the tendon sheath.
Diagnosis: Fibroma of tendon sheath, which exhibited radiographic features similar to those of giant cell tumor of tendon sheath. Excisional biopsy demonstrated spindle-shaped cells and collagen-like stroma.
Interventions: The patient underwent excision biopsy.
Outcomes: The patient recovered well and showed no signs of recurrence at 6-month follow-up.
Lessons: This case provides valuable insights for foot and ankle surgeons. While radiological investigations are helpful in many diseases, histological examination is indispensable for establishment of the ï¬nal diagnosis.
Abbreviations: FTS = ï¬broma of tendon sheath, MRI = magnetic resonance imaging. GCTTS = giant cell tumor of tendon sheath.
