A case of slowly progressive cauda equina syndrome caused by invasive lobular carcinoma of the left breast with leptomeningeal carcinomatosis

Key Points

• To report a rare case of cauda equina syndrome as the initial symptom of invasive lobular carcinoma with leptomeningeal spread.
• Clinical evaluation of the patient’s symptoms over 14 months.
• Cerebrospinal fluid analysis for malignant cells.
• Immunostaining for estrogen receptors and cytological examination.
• Confirmed diagnosis of lobular carcinoma with metastasis to the colon.
• Identification of estrogen receptor-positive cells in cerebrospinal fluid.
• Demonstrated progressive neurological symptoms as initial presentation.