Pineal gland

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The pineal gland is thingy that is most noted for the fact that it calcifies with age.

Normal histology

See Neurohistology#Pineal gland.
  • Cellular.

Overview

Non-neoplastic:

  • Cysts

Tumours:[1]

  • Primary pineal tumours ~15% of (pineal) tumours - benign to malignant:[2]
    • Pineocytoma.
    • Pineal parenchymal tumor of intermediate differentiation.
    • Pineoblastoma.
  • Germ cell tumours:
  • Others:

Pineal gland cyst

  • Quite common. [3]
  • large cysts can cause CSF obstruction. [4]

  • Pineal gland cyst found at autopsy. (WC/Marvin101)

  • Pineal gland cyst. HE, low mag. (WC/jensflorian)

  • Pineal gland cyst. HE, higher mag. (WC/jensflorian)


Pineocytoma

General

  • Benign tumour of the pineal gland.
    • WHO Grade I.

Microscopic

Features:

  • Cytologically benign cells (uniform size of nuclei, regular nuclear membrane, light chromatin).
  • Pineocytomatous/neurocytic rosette = (irregular) rosette with a large meshwork of fibers (neuropil) at the centre.[5]
    • Similar to Homer-Wright rosette... but:
      1. Neuropil centre is larger in pineocytoma.
      2. Edge of neuropil meshwork irregular.

Notes:

  • Rosette = circular/flower-like arrangement of cells.

Images

  • Pineocytoma - intermed. mag. (WC)

  • Pineocytoma - high mag. (WC)

  • Pineocytoma - very high mag. (WC)

IHC

  • Synaptophysin +ve.
  • Chromogranin A -ve.
  • NSE +ve (cytoplasmic + nuclear).[6]
  • GFAP -ve.
    • +ve in gliomas.
  • PLAP -ve.
    • Usu. +ve in germ cell tumours.
  • Ki-67.

Another ref.:[7]

Pineal parenchymal tumor of intermediate differentiation

General

  • 20% of all pineal tumors.
  • Affects all ages.
  • ICD-O: 9362/3
  • No WHO grade yet, clinical behaviour corresponds to grade II/III[8]

Microscopic

Features:[9]

  • High cellularity.
  • Mild to moderate atypia.
  • Mitoses.
  • Usually no pinecytomatous rosettes.
  • High pleomorphism possible.

Molecular

  • Insertions in KBTBD4.[10]


Images:

  • PPID, Smear with plemorphic cells. (WC/jensflorian)

  • PPID, HE intermed. mag. (WC/jensflorian)

  • PPID, HE higher mag. (WC/jensflorian)

  • PPID, HE, rosette-like growth pattern. (WC/jensflorian)

Papillary tumour of pineal region (PTPR)

General

  • Very rare neuoepithelial tumor of adults.
  • Proposed ICD-O: 9395/3
  • No WHO grade yet, clinical behaviour corresponds to grade II/III[11]


Gross:

  • Well circumscribed.
  • Can be quite large (2-4cm).
  • Macroscopy mimics pineocytoma.

  • PTPR MRI scan (WC/marvin101)

Microscopic

Features:[12]

  • Papillary growth pattern.
  • Dense areas exhibit ependymal features.
    • Clear, vacuolated cytoplasm.
    • Rosettes.
  • Round to oval nuclei.
  • Mitoses (0-10/HPF).
  • Necroses.
  • Hyalinized vessels.

IHC

  • +ve for keratins (KL1, AE1/AE3, Cam5.2, CK18).
  • GFAP and Synaptophysin focally +ve.
  • S100+ve.
  • EMA mostly -ve.
  • NF and Kir 7.1-ve.

Molecular

  • PTEN alterations. [13]
  • Chromosome 10 loss.

DDx: Ependymoma.

Images:

  • PTPR H&E stain (WC/jensflorian)

  • PTPR CK KL1 (WC/marvin101)

  • PTPR CK18 IHC (WC/jensflorian)

  • PTPR EMA IHC (WC/marvin101)

  • PTPR Kir 7.1 IHC (WC/marvin101)

Pineoblastoma

General

  • Rare.
  • Malignant.
  • Males > females.
  • Children & young adults.
  • Corresponds to WHO IV (ICD-O: 9362/3).
  • May be a manifestation of the DICER1 syndrome.[14]

Microscopic

Features:

  • Hypercellular.
  • Mitoses.
  • Nuclear atypia.
  • Homer-wright & Flexner-Winterstein rosettes
  • Fleurettes.

IHC

  • GFAP -ve/+ve.
  • NF+ve.
  • Synaptophysin+ve
  • MIB-1: high.

Molecular

  • DICER1 mutations.[15]
  • DROSHA deletions. [16]

DDx:

Images:

  • Pineoblastoma H&E (WC/jensflorian)

  • Neurofilament IHC in Pineoblastoma (WC/jensflorian)

  • GFAP IHC in Pineoblastoma (WC/jensflorian)

See also

References

  1. ↑ Gaillard F, Jones J (October 2010). "Masses of the pineal region: clinical presentation and radiographic features". Postgrad Med J 86 (1020): 597–607. doi:10.1136/pgmj.2009.087460. PMID 20971711.
  2. ↑ Smith AB, Rushing EJ, Smirniotopoulos JG (November 2010). "From the archives of the AFIP: lesions of the pineal region: radiologic-pathologic correlation". Radiographics 30 (7): 2001–20. doi:10.1148/rg.307105131. PMID 21057132.
  3. ↑ Pu, Y.; Mahankali, S.; Hou, J.; Li, J.; Lancaster, JL.; Gao, JH.; Appelbaum, DE.; Fox, PT. (Oct 2007). "High prevalence of pineal cysts in healthy adults demonstrated by high-resolution, noncontrast brain MR imaging.". AJNR Am J Neuroradiol 28 (9): 1706-9. doi:10.3174/ajnr.A0656. PMID 17885233.
  4. ↑ Mena, H.; Armonda, RA.; Ribas, JL.; Ondra, SL.; Rushing, EJ. (Oct 1997). "Nonneoplastic pineal cysts: a clinicopathologic study of twenty-one cases.". Ann Diagn Pathol 1 (1): 11-8. PMID 9869821.
  5. ↑ Wippold FJ, Perry A (March 2006). "Neuropathology for the neuroradiologist: rosettes and pseudorosettes". AJNR Am J Neuroradiol 27 (3): 488–92. PMID 16551982.
  6. ↑ URL: http://path.upmc.edu/cases/case157/dx.html. Accessed on: 9 December 2010.
  7. ↑ URL: http://www.springerlink.com/content/k4v88n6h6jknhp2t/fulltext.pdf. Accessed on: 9 December 2010.
  8. ↑ Jouvet, A.; Saint-Pierre, G.; Fauchon, F.; Privat, K.; Bouffet, E.; Ruchoux, MM.; Chauveinc, L.; Fèvre-Montange, M. (Jan 2000). "Pineal parenchymal tumors: a correlation of histological features with prognosis in 66 cases.". Brain Pathol 10 (1): 49-60. PMID 10668895.
  9. ↑ Fèvre-Montange, M.; Szathmari, A.; Champier, J.; Mokhtari, K.; Chrétien, F.; Coulon, A.; Figarella-Branger, D.; Polivka, M. et al. (Jul 2008). "Pineocytoma and pineal parenchymal tumors of intermediate differentiation presenting cytologic pleomorphism: a multicenter study.". Brain Pathol 18 (3): 354-9. doi:10.1111/j.1750-3639.2008.00128.x. PMID 18371183.
  10. ↑ Pfaff E, Aichmüller C, Sill M, Stichel D, Snuderl M, Karajannis MA, Schuhmann MU, Schittenhelm J, Hasselblatt M, Thomas C, Korshunov A, Rhizova M, Wittmann A, Kaufhold A, Iskar M, Ketteler P, Lohmann D, Orr BA, Ellison DW, von Hoff K, Mynarek M, Rutkowski S, Sahm F, von Deimling A, Lichter P, Kool M, Zapatka M, Pfister SM, Jones DTW (February 2020). "Molecular subgrouping of primary pineal parenchymal tumors reveals distinct subtypes correlated with clinical parameters and genetic alterations". Acta Neuropathol 139 (2): 243–257. doi:10.1007/s00401-019-02101-0. PMID 31768671.
  11. ↑ Fèvre-Montange, M.; Hasselblatt, M.; Figarella-Branger, D.; Chauveinc, L.; Champier, J.; Saint-Pierre, G.; Taillandier, L.; Coulon, A. et al. (Oct 2006). "Prognosis and histopathologic features in papillary tumors of the pineal region: a retrospective multicenter study of 31 cases.". J Neuropathol Exp Neurol 65 (10): 1004-11. doi:10.1097/01.jnen.0000240462.80263.13. PMID 17021405.
  12. ↑ Heim, S.; Beschorner, R.; Mittelbronn, M.; Keyvani, K.; Riemenschneider, MJ.; Vajtai, I.; Hartmann, C.; Acker, T. et al. (Jan 2014). "Increased mitotic and proliferative activity are associated with worse prognosis in papillary tumors of the pineal region.". Am J Surg Pathol 38 (1): 106-10. doi:10.1097/PAS.0b013e31829e492d. PMID 24121176.
  13. ↑ Heim S, Sill M, Jones DT, Vasiljevic A, Jouvet A, Fèvre-Montange M, Wesseling P, Beschorner R, Mittelbronn M, Kohlhof P, Hovestadt V, Johann P, Kool M, Pajtler KW, Korshunov A, Ruland V, Sperveslage J, Thomas C, Witt H, von Deimling A, Paulus W, Pfister SM, Capper D, Hasselblatt M (March 2016). "Papillary Tumor of the Pineal Region: A Distinct Molecular Entity". Brain Pathol 26 (2): 199–205. doi:10.1111/bpa.12282. PMID 26113311.
  14. ↑ van Engelen, K.; Villani, A.; Wasserman, JD.; Aronoff, L.; Greer, MC.; Tijerin Bueno, M.; Gallinger, B.; Kim, RH. et al. (Jan 2018). "DICER1 syndrome: Approach to testing and management at a large pediatric tertiary care center.". Pediatr Blood Cancer 65 (1). doi:10.1002/pbc.26720. PMID 28960912.
  15. ↑ de Kock L, Sabbaghian N, Druker H, Weber E, Hamel N, Miller S, Choong CS, Gottardo NG, Kees UR, Rednam SP, van Hest LP, Jongmans MC, Jhangiani S, Lupski JR, Zacharin M, Bouron-Dal Soglio D, Huang A, Priest JR, Perry A, Mueller S, Albrecht S, Malkin D, Grundy RG, Foulkes WD (October 2014). "Germ-line and somatic DICER1 mutations in pineoblastoma". Acta Neuropathol 128 (4): 583–95. doi:10.1007/s00401-014-1318-7. PMC 4381868. PMID 25022261. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4381868/.
  16. ↑ Lee JC, Mazor T, Lao R, Wan E, Diallo AB, Hill NS, Thangaraj N, Wendelsdorf K, Samuel D, Kline CN, Banerjee A, Auguste K, Raffel C, Gupta N, Berger M, Raleigh DR, Shai A, Phillips JJ, Bollen AW, Tihan T, Perry A, Costello J, Solomon DA (May 2019). "Recurrent KBTBD4 small in-frame insertions and absence of DROSHA deletion or DICER1 mutation differentiate pineal parenchymal tumor of intermediate differentiation (PPTID) from pineoblastoma". Acta Neuropathol 137 (5): 851–854. doi:10.1007/s00401-019-01990-5. PMC 6483828. PMID 30877433. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6483828/.
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