In a 64‑year‑old woman presenting with blurred vision, dyspnea, generalized numbness, frequent urination and hematuria, with normal complete blood count and comprehensive metabolic panel, unremarkable brain MRI, a 1‑cm simple hepatic cyst on abdominal‑pelvic CT, hemoglobin A1c 5.2 % (ruling out diabetes) and a negative urine culture, what are the most likely causes and appropriate next diagnostic steps?

Likely Causes and Next Diagnostic Steps

This patient's constellation of symptoms—blurred vision, dyspnea, generalized numbness, frequent urination, and hematuria—with normal routine labs and unremarkable brain MRI requires urgent urologic evaluation for the hematuria and comprehensive neurologic workup for the multifocal neurologic symptoms, as these findings suggest either a systemic process affecting multiple organ systems or separate concurrent pathologies.

Addressing the Hematuria

Urologic Evaluation is Mandatory

The hematuria requires complete urologic evaluation regardless of the negative urine culture. 1 Even though the urine culture is negative, hematuria in a 64-year-old woman warrants:

• Cystoscopy - All adults with hematuria at age 35+ require cystoscopic examination 2
• Upper tract imaging - CTU (CT urography) without and with IV contrast is the standard imaging modality for hematuria evaluation 3

The 1-cm simple hepatic cyst found on CT is benign and requires no follow-up per EASL guidelines 4. Simple hepatic cysts are incidental findings that follow an indolent course and do not require surveillance imaging regardless of size 4.

Key Point on Anticoagulation

If this patient is on any anticoagulation or antiplatelet therapy, the hematuria still requires full evaluation—anticoagulation does not explain away hematuria 1, 2.

Addressing the Neurologic Symptoms

The Unremarkable Brain MRI is Concerning

The combination of blurred vision, generalized numbness, and dyspnea with a normal brain MRI does not exclude serious neurologic pathology. Several critical diagnoses can present with these symptoms:

Immediate considerations:

1. Neuromyelitis optica spectrum disorder (NMOSD) - Can present with blurred vision and numbness; initial MRI may miss early lesions or spinal cord involvement 5

2. Leptomeningeal disease - Can cause multifocal neurologic symptoms with subtle or initially negative brain MRI findings 6, 7, 8

3. Primary CNS vasculitis - Presents with headaches, visual changes, numbness, and cognitive changes; may show only subtle findings on standard MRI 9

4. Spinal cord pathology - Generalized numbness suggests possible spinal involvement not visualized on brain imaging alone

Required Next Steps for Neurologic Workup

Obtain the following immediately:

• Cervical and thoracic spine MRI with and without contrast - Essential to evaluate for spinal cord lesions, particularly given generalized numbness 5

• Lumbar puncture with comprehensive CSF analysis:

  • Cell count and differential
  • Protein and glucose
  • Cytology (multiple samples may be needed) 6
  • Oligoclonal bands
  • Aquaporin-4 antibodies (for NMOSD) 5
  • Infectious workup if clinically indicated

• Ophthalmologic examination - Formal visual field testing and fundoscopic exam to characterize the blurred vision

• Repeat brain MRI with specific sequences if initial workup suggests inflammatory/demyelinating disease:

  • Include contrast-enhanced sequences
  • Consider MR spectroscopy if focal lesion identified 7

Addressing the Dyspnea

The dyspnea requires evaluation separate from neurologic symptoms:

• Chest imaging - CT chest to evaluate for pulmonary pathology, particularly given the hematuria (to exclude malignancy with multisystem involvement)
• Pulmonary function tests if chest imaging unrevealing
• Echocardiogram if cardiac etiology suspected

Critical Pitfalls to Avoid

1. Do not dismiss hematuria because urine culture is negative - Infection is only one cause; malignancy evaluation is mandatory 1, 2

2. Do not assume normal brain MRI excludes serious neurologic disease - Spinal cord pathology, early demyelinating disease, and leptomeningeal processes can be missed 5, 6

3. Do not attribute all symptoms to a single diagnosis prematurely - This patient may have concurrent pathologies requiring separate workups

4. Do not delay cystoscopy - Even if upper tract imaging is normal, bladder visualization is essential 2, 3

Algorithmic Approach

Week 1:

• Urology referral → Cystoscopy + CTU
• Neurology referral → Spine MRI + LP
• Ophthalmology referral → Formal eye exam
• Chest CT

Week 2-3:

• Based on initial findings, proceed with:
  • Tissue biopsy if lesions identified
  • Repeat CSF analysis if initial LP non-diagnostic but suspicion remains high 6
  • Autoimmune/inflammatory serologies if suggested by imaging or CSF

The normal HbA1c (5.2%) effectively rules out diabetes as a cause of these symptoms, but this does not diminish the urgency of the required workup for hematuria and neurologic symptoms.