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.

Keywords:
Arachnoid cyst, Spontaneous resolution, Posterior fossa
1.
DiRocco C: Arachnoid cysts; in Youmans JR (ed): Neurological Surgery, ed 3. Philadelphia, Saunders, 1990, pp 1299–1325.
2.
Rengachary SS: Intracranial arachnoid and ependymal cysts; in Wilkins RH, Rengachary SS (eds): Neurosurgery, ed 2. New York, McGraw-Hill, 1996, pp 3709–3728.
3.
Bright R: Serous cysts in the arachnoid; in Longmann, Rees, Orme, Brown (eds): Reports of Medical Cases Selected with a View of Illustrating the Symptoms and Cure of Disease by a Reference to Morbid Anatomy, vol II: Disease of the Brain and Nervous System, Part I. London, Highley, 1831, pp 437–439.
4.
Sato K, Shimoji T, Yaguchi K, Sumie H, Kuru Y, Ishii S: Middle fossa arachnoid cysts: Clinical, neuroradiological and surgical features. Childs Brain 1983;10:301–316.
5.
Rakier A, Feinsod M: Gradual resolution of an arachnoid cyst after spontaneous rupture into the subdural space. J Neurosurg 1995;83:1085–1086.
6.
Weber R, Voit T, Lumenta L, Lenard HG: Spontaneous regression of a temporal arachnoid cyst. Childs Nerv Syst 1991;7:414–415.
7.
Mori T, Fujimoto M, Sakae K, Sakakibara T, Shin H, Yamaki T, Ueda S: Disappearance of arachnoid cysts after head injury. Neurosurgery 1995;36:938–942.
8.
Przybylo HJ, Radkowski MA, Przybylo J, McLone D: Spontaneous resolution of an asymptomatic arachnoid cyst. Pediatr Neurosurg 1997;26:312–314.
9.
McDonald PJ, Rutka JT: Middle fossa arachnoid cysts that come and go. Report of two cases and review of the literature. Pediatr Neurosurg 1997;26:48–52.
10.
Little JA, Gomey MA, MacCarty CS: Infratentorial arachnoid cysts. J Neurosurg 1973;39:380–386.
11.
Chan T, Logan P, Eustace P: Intermittent downbeat nystagmus secondary to vermian arachnoid cyst with associated obstructive hydrocephalus. J Clin Neuroophthalmol 1991;11:293–296.
12.
Beltramello A, Mazza C: Spontaneous disappearance of a large middle fossa arachnoid cyst. Surg Neurol 1985;24:181–183.
© 2001 S. Karger AG, Basel
2001
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