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Pituicytoma with unusual histological features
1Department of Pathology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Seoul, South Korea.
Pathology International
|September 29, 2011
Summary
Pituicytoma, a rare glial neoplasm, can present with unusual histological features mimicking other tumors. This case highlights diverse pituicytoma morphology and differentiation, aiding in diagnosis.
Area of Science:
- Neuro-oncology
- Pathology
- Endocrinology
Background:
- Pituicytoma is a rare, low-grade glial neoplasm originating in the neurohypophysis or infundibulum.
- Its rarity leads to incomplete understanding of its morphology and differentiation.
- Accurate diagnosis is crucial for appropriate patient management.
Observation:
- A 42-year-old woman incidentally found with a suprasellar mass.
- Mass enlargement and hypopituitarism symptoms developed over four years.
- Histological examination revealed features mimicking ependymoma, including perivascular pseudorosettes.
Findings:
- Tumor cells showed pleomorphism and Herring bodies, with glial fibrillary acidic protein, vimentin, and S-100 protein positivity.
- Immunohistochemistry was negative for synaptophysin and pituitary hormones.
- Ultrastructural analysis confirmed intermediate filaments, intercellular junctions, and basal lamina production.
Implications:
- This case expands the understanding of pituicytoma's diverse histological spectrum.
- Recognizing these unusual features is vital for differentiating pituicytoma from ependymoma and other neoplasms.
- Improved diagnostic criteria can enhance patient outcomes for this rare tumor.
