A challenging diagnosis of dermatofibrosarcoma protuberans of the middle finger in an infant: A case report.

Introduction: Dermatofibrosarcoma protuberans (DFSP) is a rare sarcoma, accounting for less than 0.1 % of tumors. While it predominantly occurs in adults, pediatric cases are unusual. This case report aims to highlight the diagnostic and therapeutic challenges posed by DFSP in infants due to its rarity and slow-growing nature, emphasizing the importance of early diagnosis and prompt intervention.

Case Presentation: We report the case of an 8-month-old infant presenting with a progressive finger mass, initially mistakenly diagnosed as a dermatofibroma. Local excision was done, but the tumor recurred after one year. Subsequent re-excision and skin grafting were performed, and histopathology confirmed DFSP. Despite middle finger amputation three weeks later, a new mass emerged on the adjacent ring finger after one year. This tested negative for DFSP. The fibrous mass has persisted for five years without significant changes.

Clinical Discussion: DFSP is a rare sarcoma with a higher prevalence in adults. It typically presents as a painless, slow-growing mass and is usually diagnosed by biopsy and immunohistochemistry. Surgical excision with negative margins is the preferred treatment. The rarity and slow-growing nature of DFSP pose challenges in diagnosis and treatment.

Conclusion: Early diagnosis and prompt surgical intervention are crucial in managing DFSP, especially given its high recurrence potential. Maintaining a high index of suspicion is essential even in very young children. Aggressive resection with negative margins and diligent post-operative surveillance are key strategies to mitigate metastasis risk and improve prognosis in such challenging cases.