Abstract
We discuss a case of a middle-aged woman with a history of urothelial carcinoma, who presented with subacute progression of double vision, right facial numbness, and back pain. Her MRI brain and spine demonstrated multifocal enhancing lesions at the skull base and throughout the spine. Since her initial serum and cerebrospinal fluid (CSF) studies were unrevealing, she underwent a biopsy of her skull base lesion, which was initially concerning for infection. However, her symptoms worsened despite appropriate antibiotic therapy, necessitating a spinal root biopsy that was consistent with leptomeningeal urothelial carcinoma. Her case illustrates the challenge of accurately diagnosing isolated leptomeningeal metastatic disease, which can be difficult to diagnose from CSF analysis and often requires multiple lumbar punctures to improve sensitivity. While genitourinary cancers rarely metastasize to the CNS, clinicians should retain high suspicion for neoplastic etiologies of leptomeningeal disease in patients with a history of cancer and new neurologic deficits.
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