Tumoral subtypes

Articles

• non-ossifying fibroma
  8 September 2004

  Fibrous cortical defect, cortical defect, nonossifying fibroma; non-ossifying fibroma; benign fibrous histiocytoma if mass-forming and involving the medullary cavity. NOF
  Definition: Non-ossifying fibroma is a benign, lytic lesion of fibrous origin most often observed in the metaphyseal region of the long bones in children and adolescents.
  Images
  Non-ossifying fibroma / NOF
  https://twitter.com/Maryross86/status/860657829203648512 (...)

• uterine endometrioid adenocarcinoma, FIGO grade 1
  25 November 2010

  type 1 endometrial carcinoma
  Definition: Relatively indolent tumors that arise in background of endometrial hyperplasia.
  According to one definition, when endometrial glands show a confluent pattern occupying at least 2x2 mm focus, the diagnosis of adenocarcinoma can be made. Smaller foci are labeled "complex endometrial hyperplasia".
  The diagnosis of endometrioid adenocarcinoma can also be made if there is extensive papillary pattern or infiltrative glands with desmoplastic response. (...)

• botryoid rhabdomyosarcoma
  26 October 2007

  botryoid embryonal rhabdomyosarcoma, embryonal botryoid embryonal rhabdomyosarcoma

• plexiform schwannoma
  14 September 2005

  plexiform cellular schwannoma

• thymoma type A
  7 December 2012

  Spindle cell thymoma. Thymoma, type A.
  Definition: Type A thymoma (also known as Spindle Cell Thymoma) is composed of bland spindle or oval epithelial cells admixed with few or no lymphocytes. *
  Images
  Type A thymoma (also known as Spindle Cell Thymoma)
  https://twitter.com/smlungpathguy/status/856687119540027394
  Type A thymomas generally have a thick fibrous capsule as shown here. Prominent fibrous bands course through the tumor separating it into lobules.
  Type A thymoma is the (...)

• nodular ganglioneuroblastoma
  12 March 2010

  Digital slides
  Case 26 : nodular ganglioneuroblastoma
  Definition: Ganglioneuroblastoma, nodular (GNBn) is a rare subtype of the family of neuroblastic tumors (neuroblastoma, ganglioneuroblastoma, and ganglioneuroma) that are classified in the unfavorable histology group according to the International Neuroblastoma Pathology Classification (INPC - Shimada system).
  Tumors of this subtype have been considered to represent a prototypic example of biologically and clinically nonaggressive (...)

• thymoma type B2
  7 December 2012

  Definition: Type B2 thymoma is composed of clusters of neoplastic epithelial cells in a background of abundant immature T-cells. The epithelial cell density is higher than that seen in type B1 thymoma or the normal thymus. Foci of medullary differentiation may or may not be seen. It makes up 25% to 30% of all thymomas.
  This image shows thick fibrous septa dividing the tumor into lobules.
  Type B2 thymoma is usually seen in adults in their 5th or 6th decade of life. Almost 55% of patients (...)

• poorly differentiated neuroblastoma
  14 June 2005

  See also
  neuroblastic tumors neuroblastoma ganglioneuroblastoma ganglioneuroma
  References
  Joshi VV. Peripheral neuroblastic tumors: pathologic classification based on recommendations of international neuroblastoma pathology committee (Modification of shimada classification). Pediatr Dev Pathol. 2000 Mar-Apr;3(2):184-99. PMID: #10679039#

• diffuse neurofibroma
  26 October 2009

  Diffuse-type neurofibroma
  Images
  Macroscopy : Diffuse neurofibroma https://twitter.com/RoshanNasim/status/859101427368697856
  Microscopy : Diffuse neurofibroma https://twitter.com/Greg_Charville/status/840049034840625153
  Fat entrapment in diffuse neurofibroma https://twitter.com/JMGardnerMD/status/737074287928958976
  Digital cases
  HPC:401 : Diffuse and plexiform neurofibroma in NF1
  HPC:411 : Diffuse neurofibroma in NF1
  See also
  neurofibromas localized neurofibroma plexiform (...)

• oncocytic mucoepidermoid carcinoma
  4 November 2008

  Mucoepidermoid carcinoma (MEC) is the most common salivary gland malignancy. Oncocytic MEC (OMEC) has been rarely reported with previous cases suggesting they are largely cystic low-grade neoplasms with a favorable prognosis.
  The differential diagnosis of OMEC includes numerous oncocytic/"oncocytoid" neoplasms. Some are benign while others are aggressive.
  Synopsis
  sex ratio 1/1
  age range : 30 to 79 years
  localization: parotid, sublingual gland, hard palate and neck.
  minimal cystic (...)

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