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Dynamic contrast enhanced magnetic resonance imaging findings of mass lesions of the pontocerebellar angle

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[Dynamic contrast-enhanced magnetic resonance

imaging findings of mass lesions of the pontocerebellar angle].

[Article in Turkish]

Firat AK1, Karakaş HM, Kahraman B, Firat Y, Altinok T, Kizilay A.

Author information Abstract

OBJECTIVES:

The differential diagnosis of mass lesions of the pontocerebellar angle is not always possible by conventional magnetic resonance imaging (MRI). In this study, we investigated the role of

dynamic contrast-enhanced MRI in the differential diagnosis of acoustic neurinoma, meningioma, and paraganglioma.

PATIENTS AND METHODS:

Twelve patients (8 females, 4 males; mean age 47.5 years; range 8 to 71 years) whose diagnoses were acoustic neurinoma (n=3), paraganglioma (n=5), and meningioma (n=4) were evaluated by simultaneous conventional and dynamic contrast-enhanced MRI. Prior to

postcontrast T1-weighted images, dynamic MRI was obtained. On these images, maximum contrast enhancement (Cmax) and time to peak enhancement (Tmax) were calculated at 15 different time points. Time-signal intensity curve patterns of the lesions were compared.

RESULTS:

According to the four main time-signal intensity curve patterns described in the literature, acoustic neurinomas, meningiomas, and paragangliomas exhibited type C, type A-B, and type A curve patterns, respectively.

CONCLUSION:

Our results suggest that dynamic contrast MRI may have an additional but limited role in the differential diagnosis of extra-axial intracranial tumors such as those of the pontocerebellar angle.

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