Dermatologic neoplasms

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This article deals with dermatologic neoplasms. It includes dermatologic cancer, which can be deadly. Collectively, dermatologic cancers are the most common form of cancer.

An introduction to dermatopathy is found in the dermatopathology article. Non-malignant disease is covered in the non-malignant skin disease article.

The Big Three

Squamous cell carcinoma

Main article: Squamous carcinoma

General

Precursor:[1]

  • Actinic keratosis (solar keratosis).
    • Clinical: yellow-brown scaly, patches, sandpaper sensation.

Risk factors:[1]

  • Sun exposure.
  • Immune suppression (e.g. organ transplant recipients).

Notes:

  • Keratocathoma - see non-malignant skin disease.
    • Some don't believe this entity exists.
      • These people sign this entity as low grade squamous cell carcinoma, keratoacanthoma type.[2]

Microscopic

Basal cell carcinoma

General

  • Very common.
  • Sun exposed skin.
  • Very rarely metastasizes - so rare... some don't think this is really a malignancy.

Clinical

  • Telangiectasias.
  • Raised pearly nodule.

As part of a syndrome

Microscopic

Features:[4]

  • Nest of hyperchromatic (i.e. blue) cells (similar in appearance to basal cells) with:
    • Palisading of cells at the edge of the cell nests.
    • Artefactual separation of cells (forming the nests) from the underlying stroma.

Notes:

DDx:

Melanoma

Main article: Malignant melanoma

General

  • Known as the great mimicker in pathology; it may look like many things.

Microscopic

Features:

  • Classic appearance of melanoma:
    • Loosely cohesive; mix of small nests of cells, single cells.
    • Mixed of spindle and ovoid cell morphology.
    • +/-Occasional large binucleated cells.
    • Cytoplasm: brown pigment (melanin).
    • Prominent (large) red nucleoli (like in serous carcinoma of the ovary).
    • Marked nuclear pleomorphism - variation in cell size, shape & staining (like in serous carcinoma of the ovary).
    • Nuclear pseudoinclusions (like in papillary thyroid carcinoma).

Malignant

Dermatofibrosarcoma protuberans

  • Abbreviated DFSP.

General

  • Dermal location.
  • Destroys adnexal structures.

Treatment:[5]

  • Wide excision.
  • May include imatinib (Gleevec).

Microscopic

Features:[5]

  • Dermal spindle cell lesion with storiform pattern.
    • Spokes of the wheel-pattern.
  • Contains adipose tissue within the tumour -- key feature.
    • Described as "honeycomb pattern" and "Swiss cheese pattern".

Notes:

  • Adnexal structure within tumour are preserved -- this is unusual for a malignant tumour -- important.


Main DDx:

  • Dermatofibroma - has entrapment of collagen bundles at the edge of the lesion.

DDx of storiform pattern:

Images:

IHC

Panel:[6]

  • CD34 +ve.
    • Usually negative in dermatofibroma.[7][8]
  • Factor XIIIa -ve.
    • Usually positive in dermatofibroma.[7][8]
  • S100 -ve (screen for melanoma).
  • Caldesmin -ve (screen for muscle differentiation).
  • Beta-catenin. (???)
  • MIB-1 (proliferation marker).
    • Should not be confused with MIB1 a gene that regulates apoptosis.

Molecular

A characteristic translocation is seen:[9] t(17;22)(q22;q15)

Cutaneous B-cell lymphoma

  • Abbreviated CBCL.

General

  • CBCL is less common than cutaneous T-cell lymphoma (CTCL).[10]

Microscopic

Features:

  • Dermal lymphoid infiltrate.
  • "Grenz zone" - space between the epidermis and the dermal infiltrate - key feature.

IHC

  • B cell and T cell markers.

Cutaneous T-cell lymphoma

  • Abbreviated CTCL.

General

  • Mycosis fungoides - is a subtype (???).
  • CTCL is more common than cutaneous B-cell lymphoma (CBCL).[11][12]

Microscopic

  • Atypical lymphocytes:
    • Have folded "cerebriform" nuclei; Sezary-Lutzner cells.[13]
  • Grouping:
    • Nests in the epidermis - known as "Pautrier microabscesses".
    • Single lymphocytes in epidermis; "lymphocyte exocytosis".[14]
    • Short linear arrays of lymphocytes along the basal layer of the epidermis; "epidermotropism".[13]

Images:

IHC

Features:

Merkel cell carcinoma

General

Features:[16]

  • Rare.
  • Aggressive course/poor prognosis.
  • Neuroendocrine-like.[17]

Etiology:

  • Polyomavirus (?).[16]
  • Immunocompromised/immunosuppressed (e.g. organ transplant recipients).

Microscopic

Features:[18]

  • Nests or sheets or trabeculae.
  • Scant cytoplasm.
  • Nuclear moulding.
  • Multiple small nucleoli.
  • Usually mitotically active.

Image:

IHC

  • CK7 -ve, CK20 +ve

Eccrine carcinoma

General

  • Arises from the proximal sweat duct.

Microscopic

Features:

  • Pleomorphic nuclei with nucleoli.
  • Duct-like structures - key feature.
  • Extends from dermis into epidermis (follows path of a benign sweat duct).

Notes:

Images:

Kaposi sarcoma

See Kaposi sarcoma.

Benign

Eccrine poroma

  • AKA nodular hidradenoma. (???)

General

  • Benign tumour arising from the distal sweat duct.
  • Erythematous - gross.

Microscopic

Features:[19]

  • Broad sheets of basaloid cells containing ductal structures - key feature.
  • Biphasic stroma:
    1. Edematous stroma.
    2. Sclerotic stroma.
  • Moderate nuclear pleomorphism.
  • +/-Occasional mitoses.

Notes:

  • Area above gland appears crusted.

Trichoepithelioma

General

  • Benign.
  • May be familial:
    • Multiple familial trichoepithelioma.[20]
    • Brooke-Spiegler syndrome.

Microscopic

Features:[21]

  • Well-circumscribed cell nest in the superficial dermis.
  • Surrounding by a fibrous stroma.
  • Basaloid cells with peripheral pallisading.
  • +/-Surround keratin-filled cysts.
  • Fibroblasts-like cell aggregate, similar to a follicular papillae (papillary-mesenchymal body).

Notes:

Variants:

  • Desmoplastic.

DDx:

See also

References

  1. ↑ 1.0 1.1 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1180. ISBN 978-1416031215.
  2. ↑ RS. 17 May 2010.
  3. ↑ URL: http://emedicine.medscape.com/article/1101146-diagnosis. Accessed on: 6 May 2010.
  4. ↑ 4.0 4.1 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1180-1. ISBN 978-1416031215.
  5. ↑ 5.0 5.1 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1183. ISBN 978-1416031215.
  6. ↑ AP. May 2009.
  7. ↑ 7.0 7.1 Abenoza P, Lillemoe T (October 1993). "CD34 and factor XIIIa in the differential diagnosis of dermatofibroma and dermatofibrosarcoma protuberans". Am J Dermatopathol 15 (5): 429–34. PMID 7694515.
  8. ↑ 8.0 8.1 Goldblum JR, Tuthill RJ (April 1997). "CD34 and factor-XIIIa immunoreactivity in dermatofibrosarcoma protuberans and dermatofibroma". Am J Dermatopathol 19 (2): 147–53. PMID 9129699.
  9. ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1249. ISBN 978-1416031215.
  10. ↑ URL: http://emedicine.medscape.com/article/1099540-overview. Accessed on: 24 August 2010.
  11. ↑ URL: http://emedicine.medscape.com/article/1099540-overview. Accessed on: 24 August 2010.
  12. ↑ URL: http://emedicine.medscape.com/article/1098342-overview. Accessed on: 24 August 2010.
  13. ↑ 13.0 13.1 Klatt, Edward C. (2006). Robbins and Cotran Atlas of Pathology (1st ed.). Saunders. pp. 385. ISBN 978-1416002741.
  14. ↑ URL: http://www.mdconsult.com/das/book/body/199872830-2/0/1709/I4-u1.0-B978-0-443-06694-8..50117-2--f2.fig. Accessed on: 6 May 2010.
  15. ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1185. ISBN 978-1416031215.
  16. ↑ 16.0 16.1 Calder, KB.; Smoller, BR. (May 2010). "New insights into merkel cell carcinoma.". Adv Anat Pathol 17 (3): 155-61. doi:10.1097/PAP.0b013e3181d97836. PMID 20418670.
  17. ↑ Pulitzer, MP.; Amin, BD.; Busam, KJ. (May 2009). "Merkel cell carcinoma: review.". Adv Anat Pathol 16 (3): 135-44. doi:10.1097/PAP.0b013e3181a12f5a. PMID 19395876.
  18. ↑ Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 491. ISBN 978-0781765275.
  19. ↑ URL: http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675(06)70190-5. Accessed on: 2 July 2010.
  20. ↑ Salhi, A.; Bornholdt, D.; Oeffner, F.; Malik, S.; Heid, E.; Happle, R.; Grzeschik, KH. (Aug 2004). "Multiple familial trichoepithelioma caused by mutations in the cylindromatosis tumor suppressor gene.". Cancer Res 64 (15): 5113-7. doi:10.1158/0008-5472.CAN-04-0307. PMID 15289313.
  21. ↑ URL: http://emedicine.medscape.com/article/1060049-workup#a0723. Accessed on: 31 August 2011.
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