Paraneoplastic neurological syndrome: patient with anti-Yo antibody and breast cancer: a case report.

Presented here is the case of a paraneoplastic cerebral degeneration (PCD) in a female patient with breast cancer and the indication of anti-Yo antibodies in the cerebrospinal fluid (CSF) and serum. The patient's primary indications were dizziness and a severe gait ataxia. The indication of anti-Yo antibodies led to the conclusion of the existence of a paraneoplastic cerebral degeneration. The antibodies in question are anti-Purkinje-cell autoantibodies acting against the antigens common to tumor and Purkinje cells which occur in association with a certain percentage of breast or ovarian cancers. The diagnosis of the primary tumor, that is clinically undetectable with conventional imaging processes, is performed with the aid of positron emission tomography (PET) to detect the presence of axillary lymph node metastases. The micro-invasive mammary carcinoma was able to be localized with the aid of MR mammography and, after MR mammography marking, was removed. The patient subsequently received adjuvant treatment with epirubicine and cyclophosphamide. This treatment failed to influence the paraneoplastic neurological symptoms.