Trans-sellar trans-sphenoidal encephaloceles: report of two cases.

Trans-sphenoidal encephaloceles are rare entities. Only about 20 such cases have been reported in the world literature to date. Among these, the trans-sellar variety is rarest (five cases). We present two cases of trans-sellar trans-sphenoidal encephaloceles seen over the last 12 years. The first case was a 5 month old male infant presenting with nasal obstruction and a mass in the mouth. The second case was a 14 year old boy presenting with chronic nasal obstruction since early childhood. In the first case, the mass was coming to the mouth through the split palate. In the second case, the mass could be seen in the posterior half of the nose by rhinoscopy. The computed tomography scans including coronal and sagittal reconstructions had revealed trans-sellar trans-sphenoid encephaloceles in both the patients. The magnetic resonance imaging in the second case showed the cavity and the structures of the floor of the third ventricle forming the main fundal contents. The magnetic resonance angiography revealed dipping of the ectatic anterior cerebral arteries in the neck of the encephalocele sac in this case. Extracranial trans-palatal approach and the repair of encephalocele was done in the first case with the palatal reconstruction at the same sitting. In the second patient, a trans-nasal approach with bilateral maxillotomies was performed to repair the encephalocele, and the skull base defect was repaired by a split rib graft, which was fixed with mini-plate and screws posteriorly at the clivus and anteriorly at the anterior edge of the bony defect. The cleft lip and hypertelorism also were corrected at the same sitting. Our first case had CSF leak on the 10th postoperative day and developed fulminant meningitis, despite appropriate antibiotics, and succumbed. The second patient had a good postoperative recovery and a satisfactory follow up for 2 years. Copyright 2002 Harcourt Publishers Ltd.