Bihormonal or plurihormonal pituitary tumors produce two or more hormones different in chemical composition, immunoreactivity, and clinical significance. Immunohistochemical and electron microscopic investigations and more recently molecular-genetic studies have provided conclusive evidence of the production of multiple hormones by pituitary adenomas. Most frequently, they produce GH, PRL, TSH, and/or alpha-subunit of the glycoprotein hormones. Other uncommon combinations may also be apparent. We report the case of a 40-yr-old acromegalic man with a pituitary macroadenoma. The pituitary tumor was removed by transsphenoidal surgery. Histological, immunohistochemical, electron microscopic, and immunoelectron microscopic examinations revealed that the tumor contains multiple hormones (GH, LH, and alpha subunit) and transcription factors. The application of different reagents yielded different patterns of positivity indicating that the validity of some common immunohistochemical reagents must be re-evaluated.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1385/ep:17:3:291 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Correlates of prolonged length of stay after endoscopic transsphenoidal surgery for pituitary adenomas: varying definitions and non-clinical factors.
Pituitary
January 2025
Department of Neurological Surgery, University of Miami Miller School of Medicine, 1095 NW 14th Terrace, 2nd Floor, Miami, Fl, 33136, USA.
Purpose: Prolonged length of stay (PLOS) can lead to resource misallocation and higher complication risks. However, there is no consensus on defining PLOS for endoscopic transsphenoidal pituitary surgery (ETPS). Therefore, we investigated the impact of varying PLOS definitions on factors associated with PLOS in patients undergoing ETPS.
View Article and Find Full Text PDFSelective resection of the medial wall of the cavernous sinus in pituitary surgery: results of a prospective single center analysis.
Pituitary
January 2025
Department of Neurosurgery, Mayo Clinic, Jacksonville, FL, USA.
Purpose: Pituitary adenomas, despite their histologically benign nature, can severely impact patients' quality of life due to hormone hypersecretion. Invasion of the medial wall of the cavernous sinus (MWCS) by these tumors complicates surgical outcomes, lowering biochemical remission rates and increasing recurrence. This study aims to share our institutional experience with the selective resection of the MWCS in endoscopic pituitary surgery.
View Article and Find Full Text PDFPituitary adenomas: biology, nomenclature and clinical classification.
Rev Endocr Metab Disord
January 2025
Pituitary Center, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
An 'adenoma' is a benign neoplasm composed of epithelial tissue, and has been standard nomenclature for primary pituitary neoplasms. In 2022, the fifth edition of the WHO Classification of Endocrine Tumours and of Central Nervous System Tumours, renamed pituitary adenomas as neuroendocrine tumours (NETs), assigning an oncology label to pituitary invariably benign neoplasms. Multidisciplinary workshops convened by the Pituitary Society have questioned the process, validity, and merit of this arbitrary change, while addressing the adverse clinical implications of the proposed new nomenclature.
View Article and Find Full Text PDFDNA Methylation in Pituitary Adenomas: A Scoping Review.
Int J Mol Sci
January 2025
Department of Neurosurgery, Odense University Hospital, DK-5000 Odense, Denmark.
Pituitary adenomas are a diverse group of neoplasms with variable clinical behavior. Despite advances in genetic analysis, understanding the role of epigenetic modifications, particularly DNA methylation, remains an area under investigation. This scoping review aimed to update and synthesize the current body of literature on DNA methylation in pituitary adenomas, focusing on methodological advancements and clinical correlations.
View Article and Find Full Text PDFA retrospective analysis of 338 surgically treated pituitary adenomas.
World Neurosurg
January 2025
Department of Endocrinology, The Second Affiliated Hospital, School of Medicine, The Chinese University of Hong Kong, Shenzhen & Longgang District People's Hospital of Shenzhen, Shenzhen, Guangdong, China. Electronic address:
Objective: To summarize the clinical characteristics, pituitary function assessment, postoperative pathological features, and postoperative recurrence of surgically treated pituitary adenomas (PAs).
Methods: We retrospectively reviewed the data of 338 patients (169 women; average age: 50.01 ± 12.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!