Related Experiment Videos
Spontaneous decompression of a posterior fossa arachnoid cyst: a case report
P Pandey1, M Tripathi, P S Chandra
1Department of Neurosurgery and Neurology, C.N. Center, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.
Insights
This report details a rare case of a posterior fossa arachnoid cyst in an infant that spontaneously resolved. The child experienced complete symptom improvement and cyst resolution without intervention.
Area of Science:
- Pediatric Neurosurgery
- Neurology
- Radiology
Background:
- Arachnoid cysts in the posterior fossa can cause significant neurological issues in infants, including hydrocephalus.
- Surgical intervention is typically considered for symptomatic arachnoid cysts.
- Spontaneous resolution of such cysts is exceptionally rare.
Observation:
- A 7-month-old male infant presented with macrocrania, bulging fontanelle, and upgaze paresis due to a posterior fossa, supracerebellar arachnoid cyst causing hydrocephalus.
- Symptoms dramatically improved overnight before planned surgery.
- Imaging confirmed complete resolution of the cyst and hydrocephalus.
Findings:
- The case documents the first reported instance of spontaneous regression of a posterior fossa arachnoid cyst.
- Complete resolution of hydrocephalus and associated neurological deficits was observed.
- The child remained asymptomatic at 1-year follow-up.
Implications:
- This case challenges the necessity of immediate surgical intervention for all posterior fossa arachnoid cysts.
- It highlights the potential for unexpected natural resolution, warranting further investigation into the mechanisms of cyst regression.
- Clinicians should consider observation in select cases of pediatric posterior fossa arachnoid cysts.
Abstract:
The authors present a case of spontaneous regression of a posterior fossa, supracerebellar arachnoid cyst causing hydrocephalus in a 7-month-old male child. The patient presented with macrocrania, bulging fontanelle and upgaze paresis of the eyes. There was complete improvement of these symptoms on the morning of the day of surgery without any obvious precipitating factors, including trauma. CT scan showed complete resolution of the cyst and hydrocephalus. The child was doing well at 1 year of follow-up. To the best of our knowledge, this is the first case report of spontaneous resolution of a posterior fossa arachnoid cyst.