Isolated Dupuytren's Disease in Proximal Phalanx of the Little Finger Mimicking Giant-Cell Tumor: A Rare Case Presentation.

Background and Clinical Significance: Dupuytren's disease (DD) is characterized by abnormal myofibroblast proliferation and excessive collagen deposition, leading to the formation of pathological fibrous cords. It typically affects the palmar surface of the hand, where these contractile cords cause progressive flexion contractures of the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints. Lesions involving the proximal interphalangeal (PIP) joint without significant flexion contracture may be misdiagnosed as soft-tissue tumors or inflammatory lesions based on imaging findings, including magnetic resonance imaging (MRI) and ultrasound; Case Presentation: We present a case of a soft-tissue mass located on the volar aspect of the proximal phalanx of the little finger, associated with a mild PIP joint contracture. The initial MRI findings suggested a giant-cell tumor of the tendon sheath; however, the diagnosis of Dupuytren's disease was established only after histopathological examination; Conclusions: This case highlights the importance of considering DD in the differential diagnosis of peripheral soft-tissue lesions of the finger, particularly when presenting with only mild PIP joint contracture and atypical imaging features.