Skin

• hidradenoma papilliferum
  28 August

  Localization
  vulvar hidradenoma papilliferum
  perianal hidradenoma papilliferum

• atypical poroid hidradenoma
  28 August

  Images
  https://twitter.com/Margaret_Cocks/status/786975413805481984
  See also
  hidradenomas

• nodular hidradenoma
  28 August

  hidradenoma, eccrine acrospiroma PO
  Synopsis
  nests / lobules of cells resembling eccrine poroma with either clear cytoplasm or prominent squamous metaplasia
  possible marked vascularity
  small and large lumina are lined by cuboidal ductal cells or columnar secretory cells
  cystic spaces may be due to degeneration of tumor cells
  Images
  https://twitter.com/SkinPathology/status/638584069907857409
  https://twitter.com/TexPathol/status/1038034487647633408
  Differential diagnosis (...)

• cutaneous tubular adenoma
  28 August

  Tubular papillary adenoma of the skin; Papillary eccrine adenoma PO
  Examples
  Tubular papillary adenoma of the skin https://twitter.com/GregHoslerMDPhD/status/1296809886072832004
  Synopsis
  tubules
  papillary structures
  apocrine differentiation or eccrine differentiation
  nodule / nodular formation
  benign adenomatous adnexal tumor
  cuteanous adenoma
  eccrine duct-like structures often dilated with intraluminal papillomatosis
  Differential diagnosis
  aggressive (...)

• mitotic keratinocytes
  20 August

  mitosis in keratinocytes
  Images
  mitotic keratinocytes https://twitter.com/DrAldehyde/status/1295867333580410880
  See also
  mitosis
  mitotic anomalies
  keratinocytes

• basaloid cell tumors
  17 August

  Differential diagnosis
  basaloid cell tumors basal cell carcinoma / BCC trichoepithelioma / trichoblastoma
  See also
  cutaneous tumors diagnosis of cutaneous tumors

• multiple trichoepitheliomas
  17 August

  Trichoblastomas WKP PO
  See also : trichoepithelioma
  Synopsis
  nests of basaloid cells Cells are often in fronds, may have 2 or more layers of basaloid cells. Cells may have papillary mesenchymal bodies. Basaloid cells form primitive hair follicle-germ structures (like cylindroma).
  They lack the myxoid stroma and artefactual clefting seen in basal cell carcinoma.
  Mitoses are uncommon when compared to basal cell carcinoma.
  fibromyxoid stroma
  Variants
  desmoplastic (...)

• follicular ostium
  17 August

  follicular ostia
  Anomalies
  follicular ostium obstruction

• follicular occlusion syndrome
  30 July

  Links
  Follicular occlusion syndrome
  https://dermnetnz.org/topics/follicular-occlusion-syndrome/

• biphasic basophilic dermal adnexal tumor
  28 July

  Example
  eccrine spiradenoma : benign biphasic basophilic dermal adnexal tumor
  See also
  cutaneous adnexal tumors

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