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Simultaneous occurrence of dual intracranial pathology is very rare. Most of such reported cases occur in the setting of a genetic or hereditary predisposing condition like neurofibromatosis. Though some cases of coexistence of multiple intracranial pathologies have been reported, occurrence of an arachnoid and epidermoid cyst in the same patient has never been reported. A 16-year-old boy was referred to us with a diagnosis of left temporal arachnoid cyst. Careful review of the MRI showed the presence of 2 different signal intensities with restricted diffusion in the cyst in the ambient cistern and normal diffusion in the cyst anterior to the temporal tip suggesting the presence of an arachnoid cyst adjacent to an epidermoid cyst which was managed using endoscope-assisted microsurgical transcranial surgery. The possibility of such an association could be explained based on the congenital origin of both lesions. Diffusion-weighted imaging can be invaluable in unraveling such a relationship., ((c) 2010 S. Karger AG, Basel.)

Posterior fossa glioblastoma multiforme is a very rare childhood tumor with an extremely poor prognosis. There are only few cases of primary cerebellar glioblastoma described in the literature, and primary cerebellar glioblastoma presenting radiologically as a cerebellopontine angle mass lesion has not been reported previously. The authors report a multicentric glioblastoma multiforme in an 11-year-old child presenting predominantly as a cerebellopontine angle mass lesion, who finally expired 2 months after surgery. The presentation was very bizarre and the diagnosis was made only after histopathology examination.

Neonatal intracranial aneurysms are rare, with only 20 cases being reported in the literature. No case of spontaneous resolution of a giant intracranial cavernous segment aneurysm in a neonate is reported till date. The authors describe a 3-week-old male child who presented with a left-sided tonic seizure episode and was diagnosed as having a right-sided giant cavernous internal carotid artery aneurysm. The aneurysm was found to be totally thrombosed on angiography done before planning definitive treatment. The child is doing well at 2 years of follow-up. Spontaneous thrombosis, an exceptionally rare but fortunate outcome in a rare case of giant neonatal internal carotid artery aneurysm, has led the authors to report this case. The need of repeat imaging or angiography should be considered to rule out this rare outcome, more so if there is any delay between the ictus and treatment., (2008 S. Karger AG, Basel)

We describe a case of a giant third ventricular colloid cyst occurring in a 10-year-old child with unusual imaging features and discuss the causes for these imaging findings., ((c) 2007 S. Karger AG, Basel.)

The authors describe the MRI findings of a primary orbital Ewing's sarcoma in a 5-year-old boy, who underwent an extensive tumour surgery as these findings were mistaken for more chemoresistant sarcomas such as rhabdomyosarcoma. This case illustrates the fact that MR findings of primary orbital Ewing's sarcoma may be different from those of Ewing's sarcoma present elsewhere in the body. An accurate preoperative diagnosis may therefore result in a more conservative approach and prove extremely useful in such tumours.