He was born at gestation week 28 to a 30-year-old multipara at our hospital by Cesarean section delivery due to premature rupture of the maternal membrane. His birth weight was 1,450 g and his Apgar scores were 6 and 9 at 1 and 5 minutes, respectively. After birth, he was provided positive pressure ventilation and intubated. He also suffered respiratory distress and was treated with surfactant and by mechanical ventilation. On the 24th day after birth, he was presented with fontanel bulging with slight activity reduction. Moro reflex was partial but symmetric, and his pupils were of equal size and reactive to light bilaterally. Ultrasonography and MRI of the brain revealed severe hydrocephalus (Fig. 1). External ventricular drainage was performed, and 8 days later at a body weight of 1,600 mg, a ventriculo-peritoneal shunt was inserted using contoured-shape ultrasmall PS Medical vlave. Two months after shunt surgery, follow-up CT and MRI showed pericatheter ventricular cyst formation (Fig. 2). Burr hole drainage of the pericatheter cyst was performed, and 80 cc of a yellowish translucent fluid was aspirated. Fluid analysis revealed, a cell count of 6/uL (polymorphous nuclear cells 17%), glucose 36 mg/dL, protein 2633 mg/dL, and gram stain negativity, and culture showed no growth of bacteria and fungus. The drain catheter was removed on the 9th day after insertion and a follow up CT scan revealed near total cyst disappearance. Two months later, head enlargement and a tense fontanel were noted, and follow up MRI revealed intraparenchymal cyst regrowth with normally sized ventricle. Because reinsertion of the new proximal catheter into the ventricle was considered difficult without direct visualization, craniotomy and shunt revision was planned.Craniotomy and opening of the cyst revealed a pseudocyst
INTRODUCTIONSince the introduction of cerebrospinal fluid (CSF) shunting procedures, they have been one of the main methods of managing hydrocephalus. However, complications of shunt surgery may impede the management of hydrocephalus, and have been reported to affect about 20 to 30 percent of cases during long term follow up 11,12) . Infection and obstruction are the most common complications, though improvements in shunt valve design have diminished complication rates caused by nonphysiologic hydrodynamics of the shunt system. The spread of CSF into brain parenchyma is a rare complication of a ventriculoperitoneal shunt 2,5,10,14,18) , and can take the form of CSF edema or a reversible porencephalic cyst 13) . Pericatheter cysts have been described in relation to a blocked shunt in children and adults, but it has not been previously reported in a premature infant. The authors present a case of an intraparenchymal CSF cyst in a premature infant who happens to be the youngest patient ever reported with this condition.
CASE REPORTAn one-day-old male infant was admitted to our neonatal intensive care unit due to weak crying and whole body cyanosis. A ventriculo-peritoneal shunt is a standard surgical management for hydroc...