eISSN: 1509-572x
ISSN: 1641-4640
Folia Neuropathologica
Current issue Archive Manuscripts accepted About the journal Editorial board Journal's reviewers Abstracting and indexing Subscription Contact Instructions for authors Ethical standards and procedures
SCImago Journal & Country Rank
 
2/2014
vol. 52
 
Share:
Share:
more
 
 
abstract:

Original article
Secretory meningiomas: immunohistochemical pattern of lectin and ultrastructure of pseudopsammoma bodies

Anna Taraszewska
,
Ewa Matyja

Folia Neuropathol 2014; 52 (2): 141-150
Online publish date: 2014/06/30
View full text
Get citation
ENW
EndNote
BIB
JabRef, Mendeley
RIS
Papers, Reference Manager, RefWorks, Zotero
AMA
APA
Chicago
Harvard
MLA
Vancouver
 
Secretory meningioma is an infrequent histological subtype of benign, WHO grade I meningioma, that is characterized by focal epithelial and secretory transformation of meningothelial cells. The leading histopathological feature of neoplastic tissue is the presence of eosinophilic hyaline inclusions, defined as “pseudopsammoma bodies”. These inclusions are mostly intracytoplasmic, different in size and often multiple. They are stained with periodic acid-Schiff (PAS) and are immunopositive for epithelial and secretory markers.

The aim of this study was to determine the pattern of lectin bindings and ultrastructural features of secretory meningiomas. The examination was performed on 8 cases of secretory meningiomas that occurred in women and were mostly associated with prominent peritumoural oedema. Histologically, the tumours exhibited numerous eosinophilic, PAS positive pseudopsammoma bodies. Immunohistochemical studies revealed a strong, ring-like cytokeratin expression around the pseudopsammoma bodies. The inclusions were CEA and EMA positive but negative for vimentin. The immunolabeling with four lectins (PNA, SBA, Con A and DBA) was studied. The majority of pseudopsammoma bodies and surrounding tumour cells were strongly labelled with PNA and SBA. Immunolabelling with Con A showed irregular staining with high intensity in small inclusions. Immunostaining with DBA was seldom positive in inclusions and negative in the tumour cell cytoplasm. Ultrastructure of pseudopsammoma bodies exhibited advanced heterogeneity. The size of inclusions and the content of intracytoplasmic lumina varied greatly. Some pseudopsammoma bodies seemed to be located extracellularly and lacked the obvious lumina.

Our ultrastructural study and lectin binding pattern support the unique epithelial and secretory transformation of neoplastic cells connected with their altered glycosylation.
keywords:

secretory meningioma, pseudopsammoma bodies, lectins, ultrastructure, immunohistochemistry

Quick links
© 2021 Termedia Sp. z o.o. All rights reserved.
Developed by Bentus.