Skin

• porocarcinoma
  17 September 2019

  sweat gland carcinoma PO
  Images
  https://twitter.com/KayKoMD/status/1173634860377882624
  Synopsis
  clear cell features
  focal squamoid differentiation
  increased cytologic atypia
  multiple mitotic figures
  ductal structures are typically present (especially in well-differentiated cases)
  See also
  eccrine poroma

• Henderson–Patterson bodies
  17 July 2019

  molluscum bodies (Henderson–Patterson body)
  Examples
  22 yo female x 2 mo. Dx: giant molluscum contagiosum . epidermal hyperplasia with crater containing pretty molluscum bodies (Henderson–Patterson bodies). Giant molluscum may indicate underlying immunodeficiency. https://twitter.com/globaldermie/status/1151159744565874688

• post-kala-azar dermal leishmaniasis
  27 June 2019

  PKDL
  Post-kala-azar dermal leishmaniasis (PKDL) is a complication of visceral leishmaniasis (VL); it is characterised by a macular, maculopapular, and nodular rash in a patient who has recovered from VL and who is otherwise well.
  The rash usually starts around the mouth from where it spreads to other parts of the body depending on severity. It is mainly seen in Sudan and India where it follows treated VL in 50% and 5-10% of cases, respectively.
  Thus, it is largely restricted to areas (...)

• dermal spindle cell lipoma
  27 June 2019

  Definition : Dermal spindle cell lipoma characterized by a mixture of mature adipocytes and spindle-shaped cells in a fibromucinous background.
  Some lesions can show a moderately well circumscribed plexiform pattern, or a well demarcated nodular pattern with compression of surrounding connective tissue and prominent stromal fibrosis.
  Clinically, the plexiform type mostly occurred in the thigh-groin-buttock area and the nodular type in the head-neck or acral location.
  While plexiform (...)

• CD56+ lymphomatoid papulosis
  13 June 2019

  Lymphomatoid papulosis with a natural killer-cell phenotype
  Examples
  Self-healing eschar-like erythematous nodule https://twitter.com/JAADjournals/status/1138792090048114688
  References
  Bekkenk, M.W., Kluin, P.M., Jansen, P.M., Meijer, C.J., and Willemze, R. Lymphomatoid papulosis with a natural killer-cell phenotype. Br J Dermatol. 2001; 145: 318–322.
  doi:10.1046/j.1365-2133.2001.04324.x.

• cutaneous CD56+ lymphoproliferations
  13 June 2019

  CD56-positive haematological neoplasms of the skin
  References
  Assaf, C., Gellrich, S., Whittaker, S. et al. CD56-positive haematological neoplasms of the skin: a multicentre study of the Cutaneous Lymphoma Project Group of the European Organisation for Research and Treatment of Cancer. J Clin Pathol. 2007; 60: 981–989. https://jcp.bmj.com/content/60/9/981.short

• angioinvasive lymphomatoid papulosis
  13 June 2019

  Angioinvasive lymphomatoid papulosis
  Paywall references
  Kempf, W., Kazakov, D.V., Scharer, L. et al. Angioinvasive lymphomatoid papulosis: a new variant simulating aggressive lymphomas. Am J Surg Pathol. 2013; 37: 1–13
  doi:10.1097/PAS.0b013e3182648596.
  Wu, W.M. and Tsai, H.J. Lymphomatoid papulosis histopathologically simulating angiocentric and cytotoxic T-cell lymphoma: a case report. Am J Dermatopathol. 2004; 26: 133–135 (...)

• matrical differentiation
  31 May 2019

  Examples
  matrical differentiation https://www.ncbi.nlm.nih.gov/pubmed/28368926
  See also
  matrical cells
  hair matrix

• matrical cells
  31 May 2019

  See also
  matrical differentiation

• dermal papillae with xanthomatous histiocytes
  15 May 2019

  dermal papillae with xanthomatous histiocytes
  Examples
  verruciform xanthoma : dermal papillae with xanthomatous histiocytes https://twitter.com/Rami_AlRohil/status/1128124213284487175

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