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Gynaecomastia can be defined as the benign proliferation of male breast glandular tissue (1) with a mass consisting of >2cm in size, which appears as firm, palpable, subareolar gland and ductal breast tissue on examination (2)
Pseudogynaecomastia is the condition in which breast enlargement occurs mainly due to excess adipose tissue formation (2).
Male breast cancer accounts for about 0.6% of all breast cancer: there almost 400 cases annually in the UK (c.f. 55,000 in women) (3).