Thyroid adenoma

from http://www.fpnotebook.com/Endo/Hemeonc/ThyrdAdnm.htm.

1. Simple or colloid Macrofollicular Adenoma

• Most common type
• Follicles of normal size

2. Embryonal (Trabecular) adenoma

• Mostly stroma and minimal follicles

3. Fetal Microfollicular Adenoma

• Small follicles with minimal colloid
• Follicular cancer found in 5% of cases

4. Hurthle Cell Adenoma (uncommon)