====== Pineal region tumor magnetic resonance imaging ======


[[Pineal region tumor]]s do not have pathognomonic imaging findings in [[MRI]]; however, [[T1]] [[hyperintensity]], which is a key for imaging diagnosis according to recent reports. In particular, if the hyperintensity in T1 is not due to [[fat]], [[calcification]], [[melanin]], or [[hemorrhage]] in a mass of the [[posterior commissure]] or [[pineal region]], the diagnosis of a [[Papillary Tumor of the Pineal Region]] (PTPR) may be suggested
((Rosa Junior M, da Rocha AJ, Zanon da Silva A, Rosemberg S. Papillary Tumor of 
the Pineal Region: MR Signal Intensity Correlated to Histopathology. Case Rep
Neurol Med. 2015;2015:315095. doi: 10.1155/2015/315095. Epub 2015 Jan 22. PubMed 
PMID: 25688307; PubMed Central PMCID: PMC4320939.
)).
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[[Pineal parenchymal tumor]]s show an “explosion” of normal pineal calcifications towards the periphery.

• [[Pineoblastoma]]s often have restricted diffusion, with apparent diffusion coefficient (ADC) values lower than germinomas.

• [[Pineal teratoma]]s and [[pineal lipoma]]s display fat signal characteristics and fat saturation on MRI.

• [[Pineal lesion]]s in patients with known malignancy should raise suspicion of metastatic involvement.

• [[Pineal cyst]]s and [[pineal arachnoid cyst]]s show MRI signal characteristics similar to cerebrospinal fluid (CSF)
((Fang AS, Meyers SP. Magnetic resonance imaging of pineal region tumours.
Insights Imaging. 2013 Jun;4(3):369-82. doi: 10.1007/s13244-013-0248-6. Epub 2013
May 3. PubMed PMID: 23640020; PubMed Central PMCID: PMC3675249.
)).

====== References ======