Reticulin Framework Assessment in Neoplastic Endocrine Pathology

Area of Science:

• Endocrine Pathology
• Histopathology
• Oncology

Background:

• The reticulin framework, primarily type III collagen, is crucial for tissue structure.
• Reticulin stains offer a reliable, cost-effective method to assess framework alterations.
• These alterations are linked to various neoplastic and non-neoplastic conditions.

Purpose of the Study:

• To review reticulin stain applications in endocrine and neuroendocrine neoplasms.
• To highlight the role of reticulin framework assessment in diagnosis and prognosis.
• To explore future directions using digital pathology and AI.

Main Methods:

• Review of literature on reticulin staining in endocrine and neuroendocrine tumors.
• Analysis of reticulin framework patterns in pituitary, parathyroid, adrenal, and other neuroendocrine neoplasms.
• Discussion of the reticulin algorithm for adrenocortical malignancy assessment.

Main Results:

• Reticulin framework loss distinguishes normal from neoplastic adenohypophysis.
• Disrupted reticulin patterns aid in diagnosing parathyroid neoplasms.
• Reticulin evaluation is key in adrenocortical neoplasm malignancy assessment and subtype differentiation.
• Tumor-specific reticulin patterns are observed in pheochromocytomas and paragangliomas.
• Higher-grade neuroendocrine carcinomas show more significant reticulin disruption.

Conclusions:

• Reticulin staining is a valuable tool for evaluating endocrine and neuroendocrine neoplasms.
• Framework alterations assist in differential diagnosis, malignancy assessment, and prognosis.
• Digital pathology and AI integration promise enhanced automated quantification and diagnostic accuracy.