Utility of four-quadrant random sections in mastectomy specimens

Area of Science:

• Surgical Pathology
• Oncology
• Breast Cancer Research

Background:

• Standard mastectomy practice includes random sampling of breast quadrants.
• The efficacy of these random sections is not well-established in existing literature.

Purpose of the Study:

• To investigate the diagnostic utility and significance of random quadrant sections in mastectomy specimens.
• To determine the rate of additional information provided by random sections compared to gross examination alone.

Main Methods:

• Retrospective analysis of 78 mastectomy specimens from 1997-2000.
• Review of clinical, radiographic, and histopathologic features, focusing on random sections.
• Tabulation of diagnoses and significant findings from random sections not apparent in gross sections.

Main Results:

• Random sections yielded additional clinically significant information in 21 of 78 cases (27%).
• Multifocal/multicentric disease was identified in 20 cases, including ductal carcinoma in situ (DCIS) and invasive carcinomas.
• Other findings included lymphovascular invasion, margin involvement by DCIS, and atypical hyperplasias, particularly in lobular carcinoma cases.

Conclusions:

• Histologic examination of random breast quadrants provides valuable information in a minority of mastectomy cases (27%).
• This additional information is crucial for detecting multifocality, multicentricity, vascular invasion, and margin involvement.
• The utility of random sections may be higher in specific morphologies, such as lobular carcinoma.