Spontaneous Regression of Congenital Posterior Fossa Lesion – Radiologically Mimicking Teratoma – Case Report

We report a case of spontaneous regression of a congenital intracranial lesion presumed to be a teratoma. Various radiological features of teratoma mentioned in the literature are vague complex echogenic mass on prenatal ultrasonography, clump like calcification on CT scan, usual size being more than 5cm, suprasellar and pineal region location. Radiological features of this lesion were consistent with teratoma. The child was managed conservatively with oral steroids as an antiedema measure. Follow up scans over 2years showed more than 80% regression in size of the lesion. This is the first reported case of presumed teratoma, on radiological imaging that regressed spontaneously.