CC BY-NC-ND 4.0 · Indian Journal of Neurosurgery 2020; 09(01): 63-66
DOI: 10.1055/s-0039-3402594
Case Report

Unusual MR Imaging Features in CT Hyperdense Posterior Fossa Dermoids: Report of Two Cases

Anbazhagan Sathiaprabhu
1  Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, India
,
Nichanametla Sravani
2  Department of Radio-Diagnosis, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, India
,
Krishnan Nagarajan
2  Department of Radio-Diagnosis, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, India
,
Sekar Sabarish
2  Department of Radio-Diagnosis, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, India
,
Kapil Patil
1  Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, India
› Author Affiliations
  

Abstract

Dermoids, either intracranial or in the rest of the body, usually have typical imaging findings due to their fat contents as fat density in computed tomography (CT) and T1- and T2-hyperintensity in magnetic resonance imaging (MRI). Variable imaging appearances have been described due to soft tissue contents, hair, calcification, or even tooth. Posterior fossa dermoids have been reported as a specific variant that shows hyperdensity in CT and mixed signal intensity in MRI. We report two cases of posterior fossa CT hyperdense dermoids that showed unusual MRI features in the form of signal loss in magnetization transfer images and lipid peak in magnetic resonance spectroscopy. Both patients underwent surgical resection and histopathological confirmation and the causes of this unusual imaging appearance are discussed.



Publication History

Publication Date:
06 February 2020 (online)

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