Invasive Breast Lobular Carcinoma with Extracellular Mucin

**Semantic type:** Neoplastic Process

**Definition:** A rare variant of invasive breast lobular carcinoma characterized by the presence of pools of extracellular mucin in which groups of floating lobular carcinoma cells are identified.

**Synonyms:** - Invasive Breast Lobular Carcinoma with Extracellular Mucin Production