Orphan tumors

Articles

• giant cell angioblastoma
  11 February 2004

  Locally aggressive soft-tissue tumor.
  Microscopy
  solid, nodular, and plexiform proliferation of oval-to-spindle cells
  frequent striking, concentric aggregation around small vascular channels
  nodular cell clusters resembling inflammatory granulomas
  giant, multinucleated cells.
  Histogenesis
  cellular aggregates were interpreted as distorted attempts at formation of vessels.
  Immunochemistry
  stromal cells positive for factor XIIIa
  stromal cells positive for histocompatability (...)

• ameloblastic fibroma
  10 April 2006

  Definition: Ameloblastic fibroma is a proliferation of immature odontogenic mesenchymal and epithelial cells. No mineralization or production of enamel, dentin or cementum is seen.
  Images
  ameloblastic fibroma
  http://www.webpathology.com/image.asp?case=660&n=1
  https://twitter.com/kimmmzms/status/491952553110691840
  http://www.webpathology.com/image.asp?n=2&Case=165
  Cases
  December 2007, Case 712-1, Department of Pathology, University of Oklahoma Health Sciences Center, (...)

• ectomesenchymoma
  29 February 2008

  malignant ectomesenchymoma

• embryonal sarcoma
  28 June 2004

  undifferentiated embryonal sarcoma

• rhabdomyomas
  10 November 2004

  rhabdomyoma
  Images
  cardiac rhabdomyoma in 2 week old female : Spider cells : Large polygonal cells with glycogen vacuoles https://twitter.com/bestpathologist/status/700584984663318528
  See also
  rhabdomyoblasts
  cardiomyocytes
  Digital slides
  Case 49 (HPC:49)
  Case 64 (HPC:64)
  Localization
  cardiac rhabdomyoma
  head and neck rhabdomyoma (#8319954#) parapharyngeal rhabdomyoma (#1530111#) multifocal rhabdomyoma of the neck (#2764225#)
  cutaneous fetal rhabdomyoma (#18300799#) (...)

• ameloblastic fibrosarcoma
  10 April 2006

  Ameloblastic fibrosarcoma is a rare tumor and only the mesenchymal component shows features of malignancy but the epithelial compoment remains bland.
  These tumors can occur de novo but can also be associated with recurrent ameloblastic fibroma or ameoloblastic fibroodontoma. There are usually no difficulties in recognizing the anaplastic features of the mesenchymal component.
  It should be noted that in some cases, particularly those with multiple recurrences, the mesenchymal component can (...)

• metanephric adenofibroma
  27 October 2003

  nephrogenic adenofibroma

• ameloblastoma
  15 December 2004

  Ameloblastoma of maxilla
  Definition: Ameloblastoma is a neoplasm that recapitulates ameloblastic development. Ameloblastoma is essentially a locally aggressive epithelial neoplasm with features of the enamel organ. Ameloblastoma bears BRAF-V600E mutations.
  Images
  Ameloblastoma
  http://www.webpathology.com/image.asp?n=1&Case=166
  https://twitter.com/dozing_dog/status/724843235567345664
  https://twitter.com/reportesVilla/status/741089067631321088 (...)

• Clara cell adenoma
  14 June 2006

  See also
  Clara cells

• odontoameloblastoma
  21 May 2008

  Odontoameloblastomas are extremely rare oral tumors. For the cases that have been described, they happen to occur in the mandible of young patients.
  In contrast to AF, they are destructive lesions on radiographs and have calcifying components.
  Histologically, these tumors have ameloblastomatous component as wlee as odontoma-like components.
  Biologically, they tend to behave like ameloblastoma and characterized by multiple recurrence and local aggression.
  See also
  ameloblastic (...)

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