A wide variety of lesions involve the pineal region,
including neoplasic and non neoplasic processes.
Tumors of the pineal region can be classified into those arising from the pineal parenchyma,
germ cell neoplasms and lesions arising from adjacent structures.
Overall they make up less than 1% of intracranial tumors in adults,
however pineal region neoplasms account for 3-8% of intracranial neoplasms in the pediatric population. We propose to attend these objectives: Provide a practical...
Lesions of the pineal region include a diverse group of entities.
Although they do not have pathognomonic imaging findings,
imaging in combination with laboratory evaluations sometimes helps narrow the differential diagnosis. In order to interpret and understand the pineal lesions,
it is important to highlight the normal anatomy of the pineal region.
Then we will focus on signs and symptoms of pineal region masses and finally we will list the imaging features of lesions of the pineal region,...
Imaging findings OR Procedure details
TUMORS OF PINEAL PARENCHYMAL ORIGIN Pineal parenchymal tumors expand and obliterate pineal architecture,
“exploding” the normal pineal calcification toward the periphery. 1.1 Pineocytoma At computed tomography (CT),
pineocytomas are well demarcated,
usually less than 3 cm,
and iso-to hyperattenuating (Fig 2). At MR imaging,
pineocytomas are also well-circumscribed lesions that are hypo-to isointense on T1-weighted images and hyperintense on T2-weighted images.
On postcontrast images,...
The differential diagnosis for pineal region lesions includes basically germ cell neoplasms and pineal cell neoplasms.
Germinoma and pineoblastoma,
have high attenuation at CT due to their high cellularity,
but if pineal calcification is seen the germinoma will tend to engulf it,
whereas in pineoblastomas it will be exploded to the periphery. The presence of lipid or fat attenuation at CT leads to the differential diagnosis of a teratoma,
Intrinsic increased T1 signal intensity...
WHO classification of tumours of the central nervous system.
Switzerland: World Health Organization,
Descriptive epidemiology of primary brain and CNS tumors: results from the Central Brain Tumor Registry of the United States,
Neuro Oncol 1999;1(1):14–25. 3.
Pineal region masses: differential diagnosis....