Primary epithelial-myoepithelial carcinoma of lung: a case report of a rare salivary gland type tumour.

摘要

Primary salivary gland type tumours (SGTTs) of lung are rare, accounting for 0.1-0.2% of all lung tumours.1 These tumours usually arise from the epithelium of tracheobronchial sub-mucosal glands and as a consequence they usually present as an endobronchial lesion with symptoms of cough, dyspnoea, wheezing, obstructive pneumonia and haemoptysis. However, despite their histiogenesis, there are several documented cases of lesions arising in the peripheral lung parenchyma, unrelated to the bronchial tract.2'3 In these cases it has been postulated that the tumours arise from a primitive stem cell.