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Dermatofibrosarcoma Protuberans Arising in a Digit: A Case Report.

Samantha Sun1, Jordan Odom2, Nathalie Ruiz3

  • 1UCF College of Medicine, Orlando, FL.

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|February 21, 2025
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Summary
This summary is machine-generated.

Dermatofibrosarcoma protuberans (DFSP), a rare soft tissue sarcoma, was diagnosed on a patient's digit. This case underscores the need to consider DFSP in CD34-positive acral tumors, with genetic testing vital for diagnosis.

Keywords:
DFSPdermatofibrosarcoma protuberansdigit

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Area of Science:

  • Oncology
  • Dermatopathology
  • Medical Genetics

Background:

  • Dermatofibrosarcoma protuberans (DFSP) is a rare, slow-growing soft tissue sarcoma.
  • DFSP typically presents on the trunk and extremities.
  • DFSP is characterized by a specific genetic translocation, t(17;22).

Purpose of the Study:

  • To report an extremely rare case of DFSP occurring on a digit.
  • To emphasize the diagnostic challenges and importance of accurate identification of DFSP in unusual locations.
  • To highlight the role of advanced molecular techniques in confirming DFSP diagnosis.

Main Methods:

  • Clinical and histological examination of an atypical CD34-positive tumor.
  • Differential diagnosis including similar entities.
  • Fluorescence in situ hybridization (FISH) to detect the COL1A1-PDGFB translocation, t(17;22)(q22;q13).

Main Results:

  • A CD34-positive tumor on the digit was identified in a 43-year-old male.
  • FISH analysis confirmed the characteristic t(17;22) translocation, confirming the diagnosis of DFSP.
  • The tumor exhibited features that initially suggested other differential diagnoses.

Conclusions:

  • DFSP can exceptionally arise on digits, presenting a diagnostic challenge.
  • CD34 positivity in acral tumors warrants consideration of DFSP in the differential diagnosis.
  • Cytogenetic analysis, specifically FISH for the t(17;22) translocation, is crucial for definitive DFSP diagnosis and guiding treatment.