Apocrine mixed tumour pathology

Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2014.

Apocrine mixed tumour is also known as apocrine chondroid syringoma. These lesions present as non-descript dermal nodules which grow slowly. They most often arise on the skin of the head and neck.

Histology of apocrine mixed tumour

Apocrine mixed tumours form a well circumscribed dermal mass. These distinctive tumours are composed of both a mesenchymal component which is usually chondroid, and an epithelial component (figure 1). The cartilage is mature, with bland chondrocytes and a silver/grey matrix (figure 2). The epithelium is bland, and consists in most areas of two cell layers: a myoepithelial layer and a lining luminal layer (figure 3).

Special studies for apocrine mixed tumour

None are generally needed.

Differential diagnosis of apocrine mixed tumour

Malignant apocrine mixed tumour: Marked atypia, numerous mitoses and lymphovascular space invasion indicate malignant transformation (fortunately a rare event). Rare cases of bland appearing apocine mixed tumour have metastasized so some authorities advocate complete surgical excision of all tumours

Eccrine mixed tumour: These are composed of quite regularly spaced small glands lined by a thin epithelium set in a fibromucinous stroma Pleomorphic adenoma: These salivary gland tumours are usually morphologically identical. The location in the parotid gland or minor salivary gland allows distinction

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