Skin

• basaloid cell tumors
  17 August 2020

  basaloid tumours
  Localizations
  cutaneous basaloid cell tumors basal cell carcinoma / BCC trichoepithelioma / trichoblastoma
  sinonasal basaloid cell tumors sinonasal basaloid carcinoma
  pulmonary basaloid cell tumors pulmonary basaloid carcinoma
  See also
  cutaneous tumors diagnosis of cutaneous tumors

• multiple trichoepitheliomas
  17 August 2020

  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 2020

  follicular ostia
  Anomalies
  follicular ostium obstruction

• follicular occlusion syndrome
  30 July 2020

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

• biphasic basophilic dermal adnexal tumor
  28 July 2020

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

• adnexal glandular tumors
  28 July 2020

  Types
  Apocrine differentiation papillary hidradenoma (papillary fronds, vulvar / perianal) tubular apocrine adenoma (epidermal connection)
  syringoma: small ducts with 2 rows of cells
  papillary eccrine adenoma: cystic ducts and papillary fronds
  papillated ducts open to epidermis papillary syringadenoma (scalp) nipple adenomatosis (nipple)
  mixed tumor ( chondroid syringoma ): chondromyxoid stroma and tubular or anastomosing glands
  sebaceous hyperplasia (lobular arrangement (...)

• dermal nodules
  28 July 2020

  Diagnosis of cutaneous nodules
  Immunochemistry
  CK7+ dermal nodules
  BerEP4 dermal nodules
  See also
  cutaneous nodules
  cutaneous tumors

• cutaneous syphilis
  21 July 2020

  Images
  Secondary syphilis: psoriasiform pattern + lichenoid infiltrate with histiocytes great clue. Plasma cells ++ plasmacytic infiltration. https://twitter.com/JRamirezMD/status/782747788907991040 https://twitter.com/drmehrarohit/status/1285302923694505984

• cutaneous blue round cell tumors
  17 April 2020

  Etiology
  Merckel cell tumor / Merckel tumor
  metastatic neuroendocrine tumors
  metastatic blue round cell tumors neuroblastoma / neuroblastic tumors Ewing sarcoma / peripheral neuroectodermal tumors cutaneous localization of lymphomas
  See also
  cutaneous tumors

• invisible dermatoses
  17 April 2020

  invisible dermatosis
  Definition : ’Invisible dermatoses’ is a concept which has not received wide recognition, but is nevertheless very important both clinically and histologically.
  The term invisible dermatoses has been used in two contexts:
  a) Diseases, with out definite clinical features, and are therefore "invisible" to the clinician, but yet can be diagnosed by special investigations.
  b) Dermatoses which present with definite and obvious clinical features, but subtle or hidden (...)

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