Abstract
In 1986, Rosen described an entity he termed a mucocoele-like lesion (MLL) in six women aged between 26 and 61 years. Only one patient was postmenopausal. These lesions consisted of duct–lobular units that were dilated and distended with mucin, which extravasated into the surrounding stroma, reminiscent of salivary gland lesions. In five patients the MLL presented as a symptomatic mass, and in another patient it was an incidental finding in association with intraductal carcinoma. From his observations, Professor Rosen concluded that MLLs should be included in the differential diagnosis of mucinous carcinoma and the lesions in young patients should be treated with caution, as mucinous carcinoma is rare in this age group. The pathogenesis of MLLs is unclear. Breast epithelium secretes acid and neutral mucins, which are present in both benign and malignant lesions (Spicer et al. 1962). MLL most likely arises due to accumulation of mucin in the ducts and lobular units with resultant dilatations and subsequent leakage of the mucin into the surrounding stroma. Mucocoele-like lesion and mucocoele-like tumour are used interchangeably in the publications.
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Chinyama, C.N. (2014). Mucocoele-Like Lesions. In: Benign Breast Diseases. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-41065-9_12
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