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| Glandular | Tumor is composed of glands. | 
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| Acinar | Tumor is composed of small glandular clusters with small lumens. While this is a subclass of glandular, it is very characteristic of MMTV-induced tumors. | 
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| Cribriform | Tumor is composed of sheets or nests of cells forming lumens with round, punched out spaces.. |
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| Papillary | Tumor has finger-like projections composed of epithelium covering a central fibrovascular core. |
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| Solid | Tumor is composed of solid sheets of epithelial cells with little or no glandular differentiation. |
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| Squamous | Tumors composed solely of squamous cells with or without keratinization, absence of glandular pattern. | 
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| Fibroadenoma | Tumor is composed of a proliferation of both myxoid fibrous stroma and glands. | 
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| Adenomyoepithelioma | Tumor is composed of myoepithelium and glands. |
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| Adenosquamous | Tumor has both glandular and squamous differentiation. | 
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| Not Otherwise Specified (NOS) | Tumor does not have any of the other common descriptor patterns. |
Use of table and images is courtesy of Oncogene (nature publishing group)
Cardiff et al, Oncogene (2000) 19, 968-988