Mucinous cystadenocarcinoma

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Mucinous cystadenocarcinoma is a rare tumor that can occur in the breast or ovary. These tumors usually form multiple, smooth-walled cysts (multilocular) and may contain blood products or cellular debris inside the cysts.

Classification of these tumors is difficult and controversial. They fall on a spectrum from clearly benign lesions with no invasion to malignant tumors that invade surrounding tissue. Some tumors show epithelial atypia (abnormal cells) but do not invade; for these, the malignant potential is uncertain. In some cases, a cyst can rupture and mucus (mucin) can leak into nearby tissue, a phenomenon that can occur with mucinous cystic tumors.

Because this is a rare and specialized condition, evaluation by oncology and pathology experts is important.