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dermal dendrocytic hamartoma

Wednesday 25 May 2005


- asymptomatic congenital lesion
- medallion-shaped, well-defined cutaneous tumors
- slightly atrophic appearance
- fusiform-cell tumor


- CD34+
- factor XIIIa+
- fascin+


- Giant congenital melanocytic nevus (CMN) (17172504)

  • Giant congenital melanocytic nevus (CMN) might be complicated by the development of several tumor types, mainly melanoma and rhabdomyosarcoma, but also poorly differentiated neoplasms.
  • Striking polypoid exophytic masses occasionally result from neuroectodermal and neuromesenchymal hamartomatous overgrowths, which lends support to the concept of pluripotential melanoblastomatous and neurocristic origin of these lesions.
  • There are some examples of dermal hamartomatous polypoid CD34(+) fibrogenic proliferation devoid of melanin, namely a dendrocytoma, surrounded by the melanocytes from the nevus, located in the skin of the scrotum against a background of giant CMN.

Electron microscopy

- typical features of dermal dendrocytes

Differential diagnosis

The differential diagnosis included:
- dermatofibrosarcoma protuberans
- giant-cell fibroblastoma
- angiofibroma
- Bednar tumor
- neurocristic cutaneous hamartoma

See also

- dendrocytic tumors


- Polypoid dermal dendrocytic hamartoma in a giant congenital melanocytic nevus. Drut R. Int J Surg Pathol. 2007 Jan;15(1):73-6. PMID: 17172504

- Rodriguez-Jurado R, Palacios C, Duran-McKinster C, Mercadillo P, Orozco-Covarrubias L, Saez-de-Ocariz Mdel M, Ruiz-Maldonado R. Medallion-like dermal dendrocyte hamartoma: a new clinically and histopathologically distinct lesion. J Am Acad Dermatol. 2004 Sep;51(3):359-63. PMID: 15337977