Histomorphometry in paraffin sections of thyroid tumors.

Area of Science:

• Oncology
• Pathology
• Cytomorphology

Background:

• Distinguishing benign thyroid adenomas from malignant carcinomas is crucial for patient management.
• Previous studies suggested quantitative differences in nuclear features between thyroid tumors.
• Objective methods are needed to complement subjective cytological assessments.

Purpose of the Study:

• To quantitatively assess planimetric nuclear features in normal thyroid tissue, benign adenomas, and malignant carcinomas.
• To determine if nuclear morphometry can objectively differentiate between thyroid adenomas and carcinomas.
• To investigate differences in nuclear area, diameter, and form factors.

Main Methods:

• Semiautomatic system used for planimetric analysis of cell nuclei from paraffin-embedded sections.
• Calculation of nuclear area, maximum diameter, and two form factors for each profile.
• Statistical analysis including T-test, multivariate tests, and discriminant analysis.

Main Results:

• Significant morphometric differences were found between normal controls and all tumor groups.
• Total discrimination achieved between follicular adenomas and carcinomas based on nuclear features.
• Carcinomas exhibited larger nuclear area and diameter, and lower form factors compared to adenomas.
• High accuracy in differentiating oxyphilic adenomas and carcinomas was also observed.

Conclusions:

• Planimetric nuclear measurements provide objective criteria for distinguishing thyroid adenomas from carcinomas.
• Nuclear morphometry is a valuable tool for cytomorphologic evaluation in thyroid tumor diagnosis.
• These quantitative methods enhance diagnostic reliability in differentiating benign and malignant thyroid lesions.