Abstract: Solid papillary carcinoma (SPC) is an uncommon breast tumor that occurs mainly in elderly women. It is composed of well-circumscribed large cellular nodules consisting of low-grade cells with neuroendocrine differentiation (rosette-like formation and expression of synaptophysin and chromogranin), and are separated by hyalinized fibrovascular cores. Mucin production is another characteristic feature of this lesion. SPC has been considered a noninvasive breast lesion ie, a variant of ductal carcinoma in situ involving larger ducts, and can be associated with invasive carcinoma in more than half of the cases. The invasive carcinoma arising in the background of SPC is typically of low grade, either colloid or “neuroendocrine-like” type, positive for estrogen receptor and progesterone receptor and negative for Her-2. Overall, SPC tends to exhibit an indolent behavior. Lymph node and distant metastases can occur rarely but are generally limited to cases of SPC with invasive carcinoma or SPC with areas suspicious for invasion.