ENDO Index

This specimen, rather obviously, has two very distinct regions.

• One region is a dense fibrous capsule.
• The other region is solid (note cut edges) and is filled with coiled tubules and loose stroma.

What solid organ consists of coiled tubules packed into a tough capsule?

Hints on the next page are more revealing.  Don't look until you are ready to confirm your identification.

More hints.