Skin

• cutaneous columnar cyst
  17 July 2018

  Cutaneous columnar cysts WKP
  Definition : Cutaneous columnar cysts are a cutaneous condition, a group of different cysts lined by columnar epithelium.
  Types
  bronchogenic cyst
  branchial cyst
  thyroglossal duct cyst
  cutaneous ciliated cyst
  median raphe cyst
  See also
  cervical cysts

• vacuolated keratinocytes
  17 July 2018

  Examples
  vacuolated keratinocytes in the superficial granular cell layer in epidermodysplasia verruciformis

• acral Spitz nevi
  30 April 2018

  Spitz nevi on acral sites are rare and poorly documented. The combination of Spitzoid cytomorphology and atypical architectural features of the junctional component may lead to an erroneous diagnosis of melanoma.
  Acral Spitz nevi is characterized by strong and diffuse P16 and P21 expression, which differs from acral nevi and acral lentiginous melanoma.
  Acral Spitz nevi are a distinctive subgroup of Spitz nevi with benign behavior.
  Awareness of the subtle histologic differentiating (...)

• eosinophilic skin diseases
  13 March 2018

  eosinophilic dermatoses
  Definition: Eosinophilic skin diseases, commonly termed as eosinophilic dermatoses, refer to a broad spectrum of skin diseases characterized by eosinophil infiltration and/or degranulation in skin lesions, with or without blood eosinophilia.
  The majority of eosinophilic dermatoses lie in the allergy-related group, including allergic drug eruption, urticaria, allergic contact dermatitis, atopic dermatitis, and eczema.
  Parasitic infestations, arthropod bites, and (...)

• multiple nevi lipomatosis cutaneous superficialis
  3 March 2018

  Hamartome lipomateux superficiel de Hoffmann-Zurhelle; Nevus lipomatosis cutaneous superficialis of Hoffmann-Zurhelle; multiple nevi lipomatosis cutaneous superficialis of Hoffmann-Zurhelle
  Nevus lipomatosus cutaneous superficialis (NLCS) is a rare hamartomatous skin lesion histologically characterised by the presence of mature fat tissue within the dermis.
  Clinically, two types of NLCS can be distinguished:
  a multiple type of Hoffmann-Zurhelle
  a solitary type.
  Histologically, the (...)

• dermal perivascular lymphocytic infiltration
  25 January 2018

  Examples
  lichen sclerosus et atrophicus
  morphea https://twitter.com/SGottesmanMD/status/1088560929212715008
  See also
  dermal lymphocytic infiltration
  perivascular lymphocytic infiltration

• anomalies of hair follicles
  25 January 2018

  Examples
  loss of hair follicles

• eyeliner sign
  27 December 2017

  Definition: “Eyeliner sign” is seen in squamous cell carcinoma in situ. Atypical keratinocytes fill epidermis but spare basal layer (line of normal basal keratinocytes under the atypical ones resembles eyeliner 👁).
  Melanoma in situ does not have this pattern.
  Images
  “Eyeliner sign” is seen in squamous cell carcinoma in situ. https://twitter.com/JMGardnerMD/status/945671045452836870

• granulomatous cutaneous inflammation
  13 September 2017

  Dermal granulomatous and necrobiotic reaction patterns
  Etiology
  epithelioid and gigantocellular cutaneous inflammation interstitial granulomatous dermatitis interstitial granulomatous drug reaction cutaneous sarcoidosis / sarcoidosis cutaneous tuberculosis cutaneous mycosis berylliosis
  necrobiotic grnauloma annular elastolytic giant cell granuloma granuloma annulare necrobiosis lipoidica diabeticorum necrobiotic xanthogranuloma rheumatoid nodule /rheumatic nodule
  foreign body (...)

• cutaneous granulomatous inflammation
  13 September 2017

  Definition
  Diagnosis
  Etiology
  See also
  cutaneous anomalies
  cutaneous diseases

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