A rapid and simple method for visualizing milky spots in large fixed tissue samples of the human greater omentum

Area of Science:

• Immunology
• Histology
• Surgical Pathology

Background:

• Milky spots are unique lymphoid structures within the greater omentum.
• These structures play a role in peritoneal cavity immune homeostasis.
• Milky spots are implicated in the formation of omental metastases.

Purpose of the Study:

• To develop a rapid and simple staining method for identifying milky spots.
• To enable macro- or stereomicroscopic identification of milky spots in large human omental tissue samples.
• To facilitate the isolation of milky spots for further research.

Main Methods:

• A novel staining protocol using an alum hematoxylin variant was developed.
• Approximately 6 × 4 cm samples of fixed human greater omentum were immersed in hematoxylin.
• The staining method allows for quick evaluation and characterization of milky spots, including their number, location, and dimensions.

Main Results:

• Hematoxylin staining imparts a distinct blue color to milky spots.
• The blue color persists through paraffin embedding and further processing.
• This method allows for easy recognition and selection of relevant slides containing milky spots.

Conclusions:

• The developed hematoxylin staining method provides a rapid, simple, and effective way to identify milky spots in fixed human greater omentum.
• This technique facilitates the macroscopic and microscopic assessment of milky spots, aiding in the study of their role in immune function and disease.
• The method supports the isolation of milky spots for subsequent detailed investigations.