Squamous cell skin, tongue, larynx, anus (ie. where stratified sq. epith.)
acanthosis: incr. thickness of prickle cell layer
hyperkeratosis: incr. amt of adherent keratin
parakeratosis: retention of nuclei of desq. keratinised cells;
Transitional cell urinary passages, esp. bladder - usually villous;
usually regarded as malignant & reported as so (recur, etc);
Columnar cell colon (villous papilloma not the tubular adenoma), breast ducts;
onychopapilloma (usually affects multiple fingernails and is due to the rare BAP1 tumor predisposition syndrome, which is caused by mutations in the BAP1 gene and associated with other malignancies such as melanoma and mesothelioma) 1)
Adenomata (solid glandular tissue):
dense masses of acini (except endocrine - solid groups of cells only)
acini lined by either columnar or cuboidal shaped cells;
if in glands that open to surface → pedunculated polyps;
may secrete XS hormones (eg APUD-cell tumours, etc);
Cystadenoma variant with elaborate cystic spaces - esp. ovary;
Fibroadenoma variant with XS CT stroma (esp. breast)