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Updated: Jun 23, 2026

Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
09:53

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Published on: July 5, 2021

Congenital Bednar's tumour.

J-W Kim1, J-E Kim, H-J Song

  • 1Department of Dermatology, Korea University Medical College, Seoul, Korea.

Clinical and Experimental Dermatology
|May 15, 2009
PubMed
Summary

Bednar tumor (BT), a rare dermatofibrosarcoma protuberans variant, can present congenitally. This case highlights a 12-year-old boy with congenital BT, successfully treated with wide local excision.

Area of Science:

  • Dermatopathology
  • Surgical Oncology

Background:

  • Bednar tumor (BT) is a rare variant of dermatofibrosarcoma protuberans (DFSP).
  • Congenital presentation of BT is exceptionally rare, with limited documented cases.

Observation:

  • A 12-year-old boy presented with a congenital lesion on his lower back, initially a depressed patch that evolved into a dome-shaped nodule.
  • Histopathological examination revealed dermal infiltration of spindle cells in a storiform pattern, admixed with melanin-containing cells.

Findings:

  • Immunohistochemical analysis showed tumor cells positive for CD34 and melanin-containing cells positive for S-100.
  • The diagnosis of Bednar tumor was confirmed based on these histological and immunohistochemical findings.

Implications:

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  • Wide local excision is an effective treatment for Bednar tumor, as evidenced by the absence of recurrence in this case.
  • This case contributes to the limited literature on congenital Bednar tumors, emphasizing the importance of considering rare diagnoses in pediatric dermatology.