Congenital dermal sinus (CDS) and occult spinal dysraphism are suspected when a cutaneous marker overlies the spine of a newborn. CDS can have the appearance of a simple dimple and occur within the gluteal cleft without any skin markers. CDS are the commonest cause of intramedullary spinal cord abscess.
Postoperative intraspinal subdural collections in children after posterior fossa tumor resection may temporarily hinder metastasis detection by MR imaging or CSF analysis, potentially impacting therapy. We investigated the incidence, imaging and clinical features, predisposing factors, and time course of these collections after posterior fossa tumor resection.