The cytopathology of reactions to ventricular shunts

Area of Science:

• Neurology
• Cytopathology
• Neurosurgery

Background:

• Ventricular shunts are crucial for managing hydrocephalus but are prone to malfunction.
• Occlusion by tissue or foreign material is a common cause of shunt failure.

Observation:

• Multinucleated histiocytic giant cells and ependymal cells were identified in cerebrospinal fluid from patients with occluded shunts.
• Benign choroid plexus epithelium clusters were observed in ascitic fluid from a patient with a ventriculoperitoneal shunt.

Findings:

• These cellular findings in cerebrospinal fluid represent the cytologic evidence of foreign-body inflammatory reactions at shunt tips.
• The presence of normal tissue emboli, such as choroid plexus epithelium, must be differentiated from metastatic cancer cells.

Implications:

• Cytologic analysis of cerebrospinal fluid provides valuable diagnostic information for shunt malfunction.
• Distinguishing benign cellular findings from neoplastic cells is critical for accurate patient management and treatment planning.