Pineal cyst epidemiology

Pineal cyst epidemiology

Usually, an incidental finding (i.e., not symptomatic), (many are microscopic). The most common ones are intra-pineal glial-lined cysts with a diameter of < 1 cm.

Although the prevalence of pineal cysts in autopsy series has been reported as being between 25% and 40%, MR studies have documented their frequency to range between 1.5% and 10.8%.

Pineal cysts are common in the pediatric population, with an increased prevalence in girls and in older patients 1).

The purpose of a high-resolution brain MR imaging study at 1.9T was to determine the prevalence of pineal cysts in healthy adults.

Brain MR images of 100 healthy young volunteers were randomly selected from our International Consortium for Brain Mapping project data base. Cysts were detected as circular areas of iso intensity relative to CSF on both 3D gradient-echo T1-weighted and 2D fast spin-echo T2-weighted images. The inner diameters of all visualized pineal cysts were measured, and a criterion of 2.0 mm of the largest inner cross-sectional diameter was used to categorize cysts as being either small cystic changes (<2.0-mm diameter) or pineal cysts (>2.0-mm diameter).

Twenty-three percent (23/100) of the volunteers had pineal cysts with a mean largest inner cross-sectional diameter of 4.3 mm (range, 2-14 mm); 13% (13/100) demonstrated cystic changes involving the pineal gland with the largest inner cross-sectional diameter of less than 2.0 mm. There was a slight female predominance. Two subjects with long-term follow-up scans showed no symptoms or changes in the size of their pineal cysts.

On high-resolution MR imaging, the prevalence of pineal cysts was 23% in a healthy group of adults, which is consistent with previous autopsy studies. Long-term follow-up studies of 2 cases demonstrated the stability of the cysts 2).

There is a prevalence rate of co-existing Rathke’s Cleft Cysts and Pineal Cyst3).


Al-Holou WN, Garton HJ, Muraszko KM, Ibrahim M, Maher CO. Prevalence of pineal cysts in children and young adults. Clinical article. J Neurosurg Pediatr. 2009 Sep;4(3):230-6. doi: 10.3171/2009.4.PEDS0951. PMID: 19772406.

Pu Y, Mahankali S, Hou J, Li J, Lancaster JL, Gao JH, Appelbaum DE, Fox PT. High prevalence of pineal cysts in healthy adults demonstrated by high-resolution, noncontrast brain MR imaging. AJNR Am J Neuroradiol. 2007 Oct;28(9):1706-9. doi: 10.3174/ajnr.A0656. Epub 2007 Sep 20. PMID: 17885233.

Mendoza J, Strickland BA, Micko A, Brunswick A, Wolfsberger S, Zada G. Prevalence rate of co-existing Rathke’s Cleft Cysts and Pineal Cysts: a multicenter cross-sectional study. World Neurosurg. 2021 Feb 7:S1878-8750(21)00185-6. doi: 10.1016/j.wneu.2021.02.004. Epub ahead of print. PMID: 33567367.

Pineal region intravascular papillary endothelial hyperplasia

Pineal region intravascular papillary endothelial hyperplasia

Intracranial intravascular papillary endothelial hyperplasia (IPEH), also referred to as Masson’s tumor, is a condition that rarely occurs in the nervous system. IPEH most frequently occurs extracranially in the skin of the face, skull, neck, and trunk and can easily be mistaken clinically, radiologically, and histologically for angiosarcoma, organizing hematoma, or other vascular malformations. IPEH accounts for roughly 2% of all vascular tumors and is extremely rare intracranially, with only 23 reported cases compared with more than 300 cases of IPEH occurring in the skin and subcutaneous tissue.

Charalambouset al. reported the case of a patient with an IPEH in the pineal region who underwent complex resection and experienced reversal of neurological symptoms 1).

There has been only one previous report of intravascular papillary endothelial hyperplasia occurrence in the pineal region. Retzlaff et al. from Milwaukee reported a second case and a review of the literature 2).



Charalambous LT, Penumaka A, Komisarow JM, Hemmerich AC, Cummings TJ, Codd PJ, Friedman AH. Masson’s tumor of the pineal region: case report. J Neurosurg. 2018 Jun;128(6):1725-1730. doi: 10.3171/2017.2.JNS162350. Epub 2017 Aug 4. PubMed PMID: 28777021.

Retzlaff AA, Arispe K, Cochran EJ, Zwagerman NT. Intravascular Papillary Endothelial Hyperplasia of the Pineal Region: A Case Report and Review of the Literature. World Neurosurg. 2019 Sep 13. pii: S1878-8750(19)32452-0. doi: 10.1016/j.wneu.2019.09.022. [Epub ahead of print] PubMed PMID: 31525486.

Papillary tumor of the pineal region

Papillary tumor of the pineal region

The WHO 2007 definition of Papillary tumor of the pineal region (PTPR) is as follows: – “A rare neuroepithelial tumor of the pineal region in adults, characterized by papillary architecture and epithelial cytology, immunopositivity for cytokeratin and ultra structural features suggesting ependymal differentiation.“ 1).
First described by Jouvet et al., in 2003 who reported six cases and called it “Papillary Tumor of Pineal region.” The tumor’s clinicopathological characteristics as described and illustrated in that series were very similar to the description of some entities reported by neuropathologists from different parts of the world. Many more independent case reports were published after Jouvet et al.’s initial report 2).

Various other names, like papillary pineocytoma, pineal parenchymal tumor, choroid plexus tumor, ependymoma and papillary meningioma have been given to these tumors in earlier reports 3).
They arise from specialized ependymocytes in the subcommissural organ, which is located in the pineal region. Characterized by papillary architecture and epithelial cytology, immunopositivity for cytokeratin and ependymal differentiation. It is considered grade II-III by the World Health Organization.
A review of the literature was performed to collect all the cases published with gross total resection and no complementary treatment. In conclusion, there is still much to be learned about the pathogenesisprognosis and management of this tumor. 4).


Papillary tumor of pineal region (PTPR) arises exclusively in the pineal region and occurs most commonly in adults with slight preponderance in females.
Till 2008, about 64 cases of PTPR have been reported 5)


The clinical behavior is often aggressive. Headache of short duration is the common presenting symptom. This occurs due to increased intracranial tension as a result of compression of the aqueduct.


They may also have a cystic component. CT imaging shows their hypodense nature and enhancement with contrast. MRI demonstrates hypointensity in T1-weighted (T1W) sequence and hyperintensity in T2-weighted (T2W) sequence and enhance with contrast 6).


Limited reports suggest surgical resection is the mainstay of treatment
The findings suggest that radiotherapy provides durable local control, particularly when administered in the adjuvant setting after GTR 7).

Case series

Little is known about the prognostic markers that might aid to identify patients at increased risk for recurrence. Therefore, the prognostic value of histopathologic and clinical features was examined in a series of 21 patients. Median age of the 12 male and 9 female patients was 35 years (range, 10 to 56 y). On histopathologic examination, all tumors were characterized by loose papillary structures and tumor cells forming broad perivascular pseudorosettes showing cytokeratin expression. In addition, tumors showed increased cellularity (n=4; 19%), nuclear pleomorphism (n=4; 19%), solid growth (n=11; 52%), necrosis (n=8; 38%), increased mitotic activity (≥3 mitoses per 10 high-power fields [n=10; 48%]), and increased proliferation (Ki67/MIB1 index ≥10% [n=8/20; 40%]). Gross total resection could be achieved in 13/21 patients (62%). Postoperatively, 13 patients received radiotherapy and 4 patients chemotherapy. Median recurrence-free survival was 66 months in 19 patients, for whom detailed follow-up information was available. Twelve patients (63%) experienced tumor progression. Three patients (16%) died of disease. Among the clinical and histopathologic features examined, only increased mitotic activity (52 [8 to 96] vs. 68 [66 to 70] mo [median [95% confidence interval]]) and proliferative activity (29 [0 to 64] vs. 67 [44 to 90] mo) were significantly associated with recurrence (P<0.05). Tumors of the 3 patients who had succumbed to disease showed increased mitotic and proliferative activity.
Increased mitotic and proliferative activities are associated with worse prognosis in papillary tumors of the pineal region 8).

Case reports

A 34-year-old male with headaches, blurred vision and normal examination. Radiological study showed a nodulocystic lesion in the pineal region compatible with pineocytoma. Surgery was performed using an infratentorial supracerebellar approach, finding a cystic tumor in the quadrigeminal cistern which was completely resected. Histopathology reported a papillary tumor of the pineal region. The patient made good progress without adjuvant therapy, and after 57 months of follow-up he remained asymptomatic and free of recurrence 9).

Kleihues P, Cavenee WK. Pathology and Genetics of Tumours of Nervous System, No. 21. Geneva: World health Organization; 1979. World Health Organization Classification of Tumors. Lyon: IARC Press; 2000.

Jouvet A, Fauchon F, Liberski P, Saint-Pierre G, Didier-Bazes M, Heitzmann A, Delisle MB, Biassette HA, Vincent S, Mikol J, Streichenberger N, Ahboucha S, Brisson C, Belin MF, Fèvre-Montange M. Papillary tumor of the pineal region. Am J Surg Pathol. 2003 Apr;27(4):505-12. PubMed PMID: 12657936.

Roncaroli F, Scheithauer BW. Papillary tumor of the pineal region and spindle cell oncocytoma of the pituitary: new tumor entities in the 2007 WHO Classification. Brain Pathol. 2007 Jul;17(3):314-8. PubMed PMID: 17598824.
4) , 9)

Cañizares Méndez MA, Amosa Delgado M, Álvarez Salgado JA, Villaseñor Ledezma JJ, Capilla Cabezuelo E, Díaz Crespo F. Papillary tumor of the pineal region: Case report and review of the literature. Neurocirugia (Astur). 2018 Apr 21. pii: S1130-1473(18)30029-0. doi: 10.1016/j.neucir.2018.03.003. [Epub ahead of print] English, Spanish. PubMed PMID: 29691144.

Fuller GN. The increasing diversity of Pineal and Sellar region tumors, Americal Association Of Neuropathologists USCAP Companion Society Inaugral Meeting Denver, CO. 2008

Epari S, Bashyal R, Malick S, Gupta T, Moyadi A, Kane SV, Bal M, Jalali R. Papillary tumor of pineal region: report of three cases and review of literature. Neurol India. 2011 May-Jun;59(3):455-60. doi: 10.4103/0028-3886.82773. PubMed PMID: 21743183.

Edson MA, Fuller GN, Allen PK, Levine NB, Ghia AJ, Mahajan A, Brown PD, DeMonte F, Li J. Outcomes After Surgery and Radiotherapy for Papillary Tumor of the Pineal Region. World Neurosurg. 2015 Mar 5. pii: S1878-8750(15)00184-9. doi: 10.1016/j.wneu.2015.02.031. [Epub ahead of print] PubMed PMID: 25749579.

Heim S, Beschorner R, Mittelbronn M, Keyvani K, Riemenschneider MJ, Vajtai I, Hartmann C, Acker T, Blümcke I, Paulus W, Hasselblatt M. Increased mitotic and proliferative activity are associated with worse prognosis in papillary tumors of the pineal region. Am J Surg Pathol. 2014 Jan;38(1):106-10. doi: 10.1097/PAS.0b013e31829e492d. PubMed PMID: 24121176.
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