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Magnetic resonance imaging of pineal region tumours.

Fang AS, Meyers SP - Insights Imaging (2013)

Bottom Line: Pineal lesions include germ cell tumours, neoplasms arising from the pineal parenchyma, as well as other pineal region masses.A variety of cases of pineal lesions are presented.Knowledge of the imaging characteristics and clinical features of varying pineal lesions can assist in narrowing the differential diagnosis for more accurate and rational therapeutic planning. • Pineal parenchymal tumours show an "explosion" of normal pineal calcifications towards the periphery. • Pineoblastomas often have restricted diffusion, with apparent diffusion coefficient (ADC) values lower than germinomas. • Pineal teratomas and pineal lipomas display fat signal characteristics and fat saturation on MRI. • Pineal lesions in patients with known malignancy should raise suspicion of metastatic involvement. • Pineal cysts and arachnoid cysts show MRI signal characteristics similar to cerebrospinal fluid (CSF).

View Article: PubMed Central - PubMed

Affiliation: Department of Imaging Sciences, University of Rochester Medical Center School of Medicine and Dentistry, 601 Elmwood Ave, Box 648, Rochester, NY, 14642, USA, adam_fang@urmc.rochester.edu.

ABSTRACT

Objectives: Pineal lesions can present as a heterogeneous collection of benign and malignant disease conditions. Pineal lesions include germ cell tumours, neoplasms arising from the pineal parenchyma, as well as other pineal region masses.

Methods: A variety of cases of pineal lesions are presented. The important clinical features and typical imaging findings of each pineal lesion are described with emphasis on their morphological appearance and signal intensity characteristics on magnetic resonance imaging (MRI).

Conclusion: Knowledge of the imaging characteristics and clinical features of varying pineal lesions can assist in narrowing the differential diagnosis for more accurate and rational therapeutic planning.

Teaching points: • Pineal parenchymal tumours show an "explosion" of normal pineal calcifications towards the periphery. • Pineoblastomas often have restricted diffusion, with apparent diffusion coefficient (ADC) values lower than germinomas. • Pineal teratomas and pineal lipomas display fat signal characteristics and fat saturation on MRI. • Pineal lesions in patients with known malignancy should raise suspicion of metastatic involvement. • Pineal cysts and arachnoid cysts show MRI signal characteristics similar to cerebrospinal fluid (CSF).

No MeSH data available.


Related in: MedlinePlus

Arachnoid cyst in a 27-year-old woman with headache and dizziness. Sagittal T2-weighted image (a) demonstrates a cystic infratentorial lesion (arrow) in the pineal recess, which has high signal. On coronal FLAIR image (b), the lesion (arrow) has isointense signal relative to CSF
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Fig17: Arachnoid cyst in a 27-year-old woman with headache and dizziness. Sagittal T2-weighted image (a) demonstrates a cystic infratentorial lesion (arrow) in the pineal recess, which has high signal. On coronal FLAIR image (b), the lesion (arrow) has isointense signal relative to CSF

Mentions: On MRI, arachnoid cysts appear as a sharply marginated extra-axial fluid collection, which is similar in signal with CSF on T1-weighted and T2-weighted images (Fig. 17). There is no post-contrast enhancement. The signal of arachnoid cysts is identical to CSF and suppresses completely on FLAIR (Fig. 17) No restricted diffusion is seen with these lesions [10].Fig. 17


Magnetic resonance imaging of pineal region tumours.

Fang AS, Meyers SP - Insights Imaging (2013)

Arachnoid cyst in a 27-year-old woman with headache and dizziness. Sagittal T2-weighted image (a) demonstrates a cystic infratentorial lesion (arrow) in the pineal recess, which has high signal. On coronal FLAIR image (b), the lesion (arrow) has isointense signal relative to CSF
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3675249&req=5

Fig17: Arachnoid cyst in a 27-year-old woman with headache and dizziness. Sagittal T2-weighted image (a) demonstrates a cystic infratentorial lesion (arrow) in the pineal recess, which has high signal. On coronal FLAIR image (b), the lesion (arrow) has isointense signal relative to CSF
Mentions: On MRI, arachnoid cysts appear as a sharply marginated extra-axial fluid collection, which is similar in signal with CSF on T1-weighted and T2-weighted images (Fig. 17). There is no post-contrast enhancement. The signal of arachnoid cysts is identical to CSF and suppresses completely on FLAIR (Fig. 17) No restricted diffusion is seen with these lesions [10].Fig. 17

Bottom Line: Pineal lesions include germ cell tumours, neoplasms arising from the pineal parenchyma, as well as other pineal region masses.A variety of cases of pineal lesions are presented.Knowledge of the imaging characteristics and clinical features of varying pineal lesions can assist in narrowing the differential diagnosis for more accurate and rational therapeutic planning. • Pineal parenchymal tumours show an "explosion" of normal pineal calcifications towards the periphery. • Pineoblastomas often have restricted diffusion, with apparent diffusion coefficient (ADC) values lower than germinomas. • Pineal teratomas and pineal lipomas display fat signal characteristics and fat saturation on MRI. • Pineal lesions in patients with known malignancy should raise suspicion of metastatic involvement. • Pineal cysts and arachnoid cysts show MRI signal characteristics similar to cerebrospinal fluid (CSF).

View Article: PubMed Central - PubMed

Affiliation: Department of Imaging Sciences, University of Rochester Medical Center School of Medicine and Dentistry, 601 Elmwood Ave, Box 648, Rochester, NY, 14642, USA, adam_fang@urmc.rochester.edu.

ABSTRACT

Objectives: Pineal lesions can present as a heterogeneous collection of benign and malignant disease conditions. Pineal lesions include germ cell tumours, neoplasms arising from the pineal parenchyma, as well as other pineal region masses.

Methods: A variety of cases of pineal lesions are presented. The important clinical features and typical imaging findings of each pineal lesion are described with emphasis on their morphological appearance and signal intensity characteristics on magnetic resonance imaging (MRI).

Conclusion: Knowledge of the imaging characteristics and clinical features of varying pineal lesions can assist in narrowing the differential diagnosis for more accurate and rational therapeutic planning.

Teaching points: • Pineal parenchymal tumours show an "explosion" of normal pineal calcifications towards the periphery. • Pineoblastomas often have restricted diffusion, with apparent diffusion coefficient (ADC) values lower than germinomas. • Pineal teratomas and pineal lipomas display fat signal characteristics and fat saturation on MRI. • Pineal lesions in patients with known malignancy should raise suspicion of metastatic involvement. • Pineal cysts and arachnoid cysts show MRI signal characteristics similar to cerebrospinal fluid (CSF).

No MeSH data available.


Related in: MedlinePlus