The presence of in laparoscopic sleeve gastrectomy specimens is associated with increased mucosal thickness, presence of secondary follicles, increased chronic inflammation, and intestinal metaplasia.

Helicobacter pylori is putatively present in over half of the global human population and is recognized as a carcinogenic agent that increases the likelihood of infected patients developing gastric adenocarcinoma or gastric lymphoma. Although there are several means for testing for , the gold standard remains the invasive histologic evaluation. The current most popular form of bariatric surgery is the laparoscopic sleeve gastrectomy (LSG) and is the only bariatric surgery which supplies a specimen for histologic evaluation.

Histologic examination of canned cat food.

Cat food production is a billion-dollar industry in the United States, with most pet owners trusting pet food companies to provide their pets with complete nutrition. Moist or canned cat food is healthier than dry kibble for cats due to its higher water content promoting healthy kidney function, but ingredient labels on canned cat food are lengthy with ambiguous terminology including 'animal by-products.' Forty canned cat food samples were collected from grocery stores and were processed using routine histologic methods.

Hidradenitis suppurativa lesions are associated with decreased collagen, decreased elastin, and increased neovascularization.

Hidradenitis suppurativa (HS) is a dermatological condition characterized by ruptured hair follicles inducing a localized, but massive chronic inflammatory response. Analysis of 104 HS lesions in formalin-fixed paraffin-embedded tissues identified the most common histologic features found associated with HS were migrating epithelial sheets, acute and chronic inflammation, perivascular chronic inflammation in regions adjacent to active lesions, and granulation tissue. Additionally, using a modified Masson's trichrome stain principally for collagen, Verhoeff van Gieson elastic stain, and CD34 immunohistochemistry assay for endothelium, lesional areas in the dermis with chronic inflammation exhibited a significant decrease in collagen and elastin, and an increase in neovascularization.