An Unusual Case of High Grade Triple Negative Intracystic Solid Papillary Carcinoma of Breast with Invasive Component

Abstract

Background: Intracystic (encysted) papillary carcinoma (IPC) is a rare distinct entity of breast cancer, usually asymptomatic, sometimes presented as breast mass or nipple discharge. It shows benign appearance on imaging. Ultrasonography shows pure cyst or mixed image, sometime solid mass. Pathologically can be divided into pure form, or associated with ductal carcinoma in situ (DCIS) or invasive carcinoma. It is considered as noninvasive or minimally invasive, because there is no infiltrating growth pattern and metastases are rare. Traditionally considered to lack a myoepithelial layer, it has favorable prognosis even with invasion. Stromal invasion found in 92%. In case of high grade variant which diagnosed by high nuclear grade and high mitotic activity, usually triple negative and p53+ as we have in our case?