PMC2728608_01
Enlarged left lobe of the thyroid with a cyst containing infected purulent material.
CRM2009-535974.001.jpg
PMC2728608_01_CRM2009-535974.001.jpg
fig1
The cut surface was pale grey to white, firm, and fibrotic, with a cystic area containing purulent exudate (Figure 1).
(a) "Subocclusive vasculitis" with inflammatory infiltrate in the thickened vessel wall. Note the keloid-like fibrosis around the vessel (hematoxylin and eosin, original magnification x20). (b) Fibrosis extending into the perithyroidal skeletal muscle (hematoxylin and eosin, original magnification x10). (c) Small follicles with scant colloid and small islands of oncocytic epithelium surrounded by an intense lymphoid infiltrate with germinal centers (hematoxylin and eosin, original magnification x40). (d) Microabscess in a dense fibrous background (hematoxylin and eosin, original magnification x40).
CRM2009-535974.002.jpg
PMC2728608_01_CRM2009-535974.002.jpg
fig2
Residual follicular epithelium was atrophic with extensive oncocytic metaplasia (Figure 2(c)).