Male, 5 years old, with history of tectal plate juvenile pilocytic astrocytoma, status post biopsy and subtotal resection with third ventriculocisternostomy at an outside hospital, status post laser ablation in 5/15, with progressive growth of the lesion, status post repeat ablation. T1 postcontrast imaging was acquired before and after laser ablation of the tectal plate lesion. Preablation images demonstrate positioning of the right frontal approach laser probe within the heterogeneously enhancing tumor. Post ablation images demonstrate increased confluent enhancement which appears to completely encompass the original lesion. A right frontal approach Ommaya catheter is in place with its tip terminating in the region of the right caudate. The lateral and third ventricles remain dilated similar to prior.
Expected findings status post laser ablation of the tectal plate tumor.