Thyroid multifocal granulomatous folliculitis (palpation thyroiditis): An immunocytochemical study

Area of Science:

• Immunology
• Endocrinology
• Pathology

Background:

• Multifocal granulomatous folliculitis, also known as palpation thyroiditis, is a clinically insignificant thyroid condition.
• Understanding the underlying immunologic processes is crucial for differentiating it from other thyroiditis types.

Purpose of the Study:

• To analyze lymphoid cell populations in multifocal granulomatous folliculitis.
• To compare the immunologic nature of palpation thyroiditis with other specific thyroiditis.

Main Methods:

• Immunohistochemical analysis using a panel of antibodies.
• Assessment of T lymphocytes (UCHL-1), B lymphocytes (L26), plasma cells (kappa/lambda ratio), and histiocytes/macrophages (KPI).

Main Results:

• T lymphocytes predominated over B lymphocytes.
• A kappa-to-lambda plasma cell ratio of 1.4:1 was observed.
• Histiocytes, macrophages, and giant cells stained strongly for KPI (CD68) and sometimes for thyroglobulin.

Conclusions:

• The immune cell profile in multifocal granulomatous folliculitis differs from Riedel's thyroiditis and Graves disease.
• Observed light chain restriction patterns may indicate distinct underlying immune responses in different thyroiditis types.