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Adnexal tumour

February 2017.

Adnexal tumour — codes and concepts

Cutaneous adnexal tumours are numerous types of benign and malignant tumours that arise from:

Adnexal tumours may be sporadic but are sometimes due to syndromes, such as:

They are usually diagnosed by biopsy findings, rather than clinically. Their histological features are combined with special immunohistochemistry stains for a pathological diagnosis.

Benign eccrine and apocrine tumours include:

  • Syringoma
  • Poroma
  • Cylindroma and spiradenoma
  • Cutaneous mixed tumor
  • Syringofibroadenoma
  • Syringocystadenoma papilliferum
  • Hidradenoma papilliferum
  • Hidradenoma
  • Tubular/papillary adenoma, including papillary cystadenoma.

Malignant eccrine and apocrine tumours include:

  • Porocarcinoma
  • Adenoid cystic carcinoma
  • Mucinous carcinoma
  • Microcystic adnexal carcinoma
  • Digital papillary adenocarcinoma
  • Extramammary Paget disease.

Benign follicular tumours include: 

  • Trichoblastoma and trichoepithelioma
  • Trichoadenoma
  • Trichofolliculoma
  • Trichilemmoma
  • Trichodiscoma and fibrofolliculoma
  • Tumour of the follicular infundibulum
  • Panfolliculoma
  • Pilomatricoma
  • Proliferating trichilemmal tumour.

Malignant follicular tumours include: 

  • Trichoblastic carcinoma
  • Trichilemmal carcinoma
  • Pilomatrix (matrical) carcinoma.

Sebaceous tumours include:




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