Gastrointestinal
metastases from invasive lobular
breast cancer are uncommon with the
stomach and
small intestines being the most common metastatic sites. Peritoneal and rectal
metastases are very rare and only rarely occur as the first manifestation of
disease. We herein
report the case of a 47-year-old
woman who presented with abdominal
carcinomatosis as a first sign of invasive lobular
breast carcinoma (ILC). Identifying the most important immunohistochemical markers for ILC gross cystic
disease fluid
protein 15,
estrogen and
progesterone receptors enabled a correct
diagnosis. After a six year
disease-free period,
relapse occurred with severe obstruction due to rectal
metastasis from lobular
breast carcinoma. Since there was no widespread metastatic
disease,
surgery with concomitant hormonal
therapy was performed.