Trichoblastoma

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Trichoblastoma
Diagnosis in short

Trichoepithelioma. H&E stain.
LM typically well-circumscribed cell nest in the superficial dermis, surrounding by a fibrous stroma, basaloid cells - usu. with peripheral palisading +/-surround keratin-filled cysts, fibroblasts-like cell aggregate, similar to a follicular papillae (papillary-mesenchymal body)
Subtypes desmoplastic
LM DDx basal cell carcinoma, dermal cylindroma, trichofolliculoma, sebaceous carcinoma, microcystic adnexal carcinoma
Site skin
Prevalence uncommon
Prognosis benign

Trichoblastoma, also known as trichoepithelioma, is an uncommon skin tumour.

Trichoepithelioma is considered a superficial version of trichoblastoma; the World Health Organization lumps the two entities together.[1]

General

  • Benign.
  • May be familial:
    • Multiple familial trichoepithelioma.[2]
    • Brooke-Spiegler syndrome.

Microscopic

Features:[3]

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

Notes:

Variants:

  • Desmoplastic trichoblastoma.

DDx:

Images

  • Trichoepithelioma - low mag. (WC/Nephron)

  • Trichoepithelioma - intermed. mag. (WC/Nephron)

  • Trichoepithelioma - high mag. (WC/Nephron)

  • Trichoepithelioma - very high mag. (WC/Nephron)

  • Trichoepithelioma - intermed. mag. (WC)

  • Trichoepithelioma - high mag. (WC)

  • Trichoepithelioma - very high mag. (WC)

www:

IHC

Features:[6]

  • CD10 +ve -- peritumoural.
    • Also reported in epithelium.[7]
    • Epithelial staining in BCC.
  • BCL2. (???)

Sign out

SKIN LESION, NOSE, BIOPSY:
- TRICHOBLASTOMA, COMPLETELY EXCISED.

Micro

The sections show well-circumscribed dermal nests of basaloid cells with peripheral palisading surrounded by a dense fibrous stroma. There is no artefactual clefting between the stroma and basaloid cell nests. Mitotic activity is minimal. Smaller hyperchromatic spindled-to-epithelioid cells in clusters (papillary-mesenchymal bodies) are found within the basaloid cells nests.

The epidermis show maturation to the surface and does not have basal atypia.

The lesion is completely excised in the plane of section.

See also

References

  1. ↑ Busam, Klaus J. (2009). Dermatopathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Saunders. pp. 383. ISBN 978-0443066542.
  2. ↑ 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.
  3. ↑ URL: http://emedicine.medscape.com/article/1060049-workup#a0723. Accessed on: 31 August 2011.
  4. ↑ URL: http://emedicine.medscape.com/article/1060049-workup#a0723 Papillary-mesenchymal body (emedicine.medscape.com). Accessed on: 22 August 2012.
  5. ↑ URL: http://skinpathologyatlas.com/tumors/hair/trichofollic.htm. Accessed on: 22 August 2012.
  6. ↑ Córdoba A, Guerrero D, Larrinaga B, Iglesias ME, Arrechea MA, Yanguas JI (July 2009). "Bcl-2 and CD10 expression in the differential diagnosis of trichoblastoma, basal cell carcinoma, and basal cell carcinoma with follicular differentiation". Int. J. Dermatol. 48 (7): 713–7. doi:10.1111/j.1365-4632.2009.04076.x. PMID 19570076.
  7. ↑ Yada K, Kashima K, Daa T, Kitano S, Fujiwara S, Yokoyama S (December 2004). "Expression of CD10 in basal cell carcinoma". Am J Dermatopathol 26 (6): 463–71. PMID 15618927.
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