Hopefully, you have identified this specimen as glandular tissue
consisting of many irregular tubules with a convoluted epithelial
lining, within a relatively thick stroma.
Note the appearance of the secretory epithelium, consisting of columnar
cells with fairly clear apical cytoplasm. Also note the occasional
appearance of acidophilic concretions within the lumens of some secretory
tubules.
The stromal composition is significant, but somewhat difficult to recognize
with confidence. (A trichrome stain would have helped. Sorry.)
Note that some of the fibers in the stroma are actually cells
(rather than extracellular collagen), with nuclei within the
eosinophilic fibers.
Only one large gland has such a texture of irregular tubules lined
by convoluted, columnar epithelium, within a fibromuscular stroma.
All of the boundaries of this specimen show cut surfaces, but the connective
tissue capsule of the organ, with a few striated muscle fibers in the
adventitia, may be seen in the region indicated by the arrow. The
striated muscle assures that this specimen did not come from within
the peritoneal cavity.
