Radiologic Differentiation of Intracranial Epidermoids from Arachnoid Cysts

Dutt, Sunil; Mirza, Showkat; Chavda, Swarupsinh; Irving, Richard

doi:10.1097/00129492-200201000-00019

Cited by 127 publications

(94 citation statements)

References 33 publications

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“…They do not enhance with contrast. The cystic contents of epidermoids often exhibit restricted diffusion on DWI (7) helping to differentiate from arachnoid cyst, which does not show diffusion restriction.…”

Section: Discussionmentioning

confidence: 99%

Role of Mri in Evaluation of Posterior Fossa Tumours With Histopathological Correlation

Durai¹,

Ganesan²,

Selvaganapathy³

et al. 2016

jemds

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Posterior fossa extends from tentorium cerebelli to foramen magnum and posterior fossa tumours are more common in children than in adults. Since posterior fossa is a critical location with limited space, even small tumours produce significant morbidity and mortality. The advent of Magnetic Resonance Imaging (MRI) has revolutionised the diagnosis and management of brain tumours. OBJECTIVESTo study the demographic profile and assess the distribution, features, localisation, and extent of posterior fossa neoplasms by MRI and to correlate the tissue characterisation by MRI with that of histopathological examination. MATERIALS AND METHODSA prospective study was done on 90 patients who were diagnosed to have posterior fossa neoplasm by magnetic resonance imaging from January 2014 to November 2015. They were followed up till surgery or biopsy for confirmatory histopathological diagnosis. The final diagnosis were correlated followed by analysis of the present study by comparing with previous similar studies from various literature. RESULTSThere was an overall male predominance with Male: Female ratio of 1.5:1. Among adults, extra-axial tumours (68%) were more frequent than intra-axial ones (32%) with vestibular schwannoma (37%) being the commonest lesion. Most common intra-axial tumour was metastasis (13%) and most common primary intra-axial tumour was haemangioblastoma (8%). Among paediatric age group, intra-axial tumours (83%) were commoner than extra-axial ones (17%) with low-grade astrocytoma (38%) as the commonest lesion followed by medulloblastoma (29%) and ependymoma (17%). Overall, 6 cases were misdiagnosed by MRI as glioma and turned out to be tuberculoma CONCLUSIONMRI proves to be a valuable modality of imaging in accurately evaluating the morphologic distribution of various intra-and extra-axial tumours in the posterior fossa. MRI can correctly diagnose 100% of extra-axial tumours and 85% of intra-axial lesions. Main tumour mimics of posterior fossa are tuberculoma and pyogenic abscess.

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Section: Discussionmentioning

confidence: 99%

Role of Mri in Evaluation of Posterior Fossa Tumours With Histopathological Correlation

Durai¹,

Ganesan²,

Selvaganapathy³

et al. 2016

jemds

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show abstract

“…Diğer oluşum mekanizmalarında kist duvarı tarafından aktif sıvı sekresyonunun olması, BOS pulsasyonu ile yavaş distansiyon veya BOS'un tek yönlü valf akımı düşünül-mektedir [145]. Travma, mastoidit, menenjit ve subaraknoid hemorajiye bağlı da görülebilir [150]. Görüntülemede komşu beyin parankimini iten veya deforme eden keskin sınırlı ekstraaksiyel kist izlenir.…”

Section: Araknoid Kistunclassified

Ekstraaksiyel Beyin Tumorleri

Cakir¹

2016

Trd Sem

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“…PA cholesteatomas are growing lesion of the squamous epithelium in the petrous part of the temporal bone [1].…”

Section: Introductionmentioning

confidence: 99%

Does Endoscopic Surgery Reduce Recurrence of the Petrous Apex Cholesteatoma?

Kumral

Uyar

Yıldırım

et al. 2013

Indian J Otolaryngol Head Neck Surg

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The aim of this study is to present the clinical symptoms, complications and treatments of the petrous apex cholesteatoma and is to describe the current role of oto-endoscopy. This was a retrospective non-randomized study of 14 petrous apex cholesteatoma surgeries performed between 1994 and 2012. Petrosectomy was performed according to the location of the cholesteatoma, hearing level of the patients and facial nerve function. Oto-endoscopy was used in the petrous apex and the cerebellopontine angle for residual cholesteatoma. 14 patients, seven were men and seven women were included in this study between 1994-2012. The most common symptom was hearing loss (85.7 %) and tinnitus (50 %) at the presentation. During the surgeries, it was observed that cholesteatoma involved most frequently facial nerve, dura and labyrinthines. Labyrinthectomy, middle cranial fossa approach and petromastoidectomy was performed to these patients. Four of six patients operated without the endoscope assistance between 1994-2006 had recurrences after the operation. These patients were re-operated and in the follow up, there was no recurrence. In the endoscopy assisted surgery, there was no recurrence observed (significance level p = 0.014). The most common complication after the surgery was hearing loss (42.8 %) but it was not significant after surgery (p [ 0.05). The petrous apex and mastoid cavity was obliterated with fat tissue in eight patients while six patients were exteriorized to follow the recurrence and it was insignificant in recurrences (p [ 0.05) Conclusion: Endoscope-assisted surgery allows to remove residual the cholesteatoma around the carotid artery, dura and facial nerve in the petrous apex resulting in less invasive surgery and less recurrence in blind spots.

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Radiologic Differentiation of Intracranial Epidermoids from Arachnoid Cysts

Abstract: The authors recommend the use of fluid-attenuated inversion recovery and diffusion sequence MRI when definitive radiologic diagnosis of cystic intracranial lesions becomes difficult with routine computerized tomographic scanning and MRI.

Cited by 127 publications

References 33 publications

Role of Mri in Evaluation of Posterior Fossa Tumours With Histopathological Correlation

Role of Mri in Evaluation of Posterior Fossa Tumours With Histopathological Correlation

Ekstraaksiyel Beyin Tumorleri

Does Endoscopic Surgery Reduce Recurrence of the Petrous Apex Cholesteatoma?

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