2.1 Acute inflammation
2.2 Adenosis
2.3 Atrophy, focal
2.3.1 Partial
2.3.2 Complete
2.3.2.1 simple
2.3.2.2 sclerotic
2.3.2.3 hyperplastic (or postatrophic hyperplasia)
2.3.2.4 combined forms
2.3.2.4.1 partial + complete
2.3.2.4.2 sclerotic + hyperplastic
2.4 Basal cells
2.4.1 Apoptotic/degenerative carcinoma cells simulating basal cells
2.5 Basal cell adenoma
2.6 Basal cell hyperplasia
2.6.1 typical
2.6.2 atypical
2.6a Blue nevus
2.7 Carcinoma
2.7.1 Adenosquamous
2.7.2 Atrophic
2.7.3 Basal cell
2.7.4 Ductal
2.7.4.1 PIN-like
2.7.5 Foamy gland
2.7.6 Intraductal
2.7.7 Lymphoepithelioma-like
2.7.8 Mucinous
2.7.9 Pleomorphic giant cell
2.7.10 Pseudohyperplastic
2.7.11 Sarcomatoid
2.7.11.1 Leiomyosarcoma-like sarcomatoid carcinoma of the prostate
2.7.12 Small cell
2.7.13 Urothelial
2.7.14 Usual
2.7.15 with Paneth cell-like change
2.8 Chronic inflammation
2.9 Clear cell cribriform hyperplasia
2.10 Corpora amylacea
2.11 Cowpers glands
2.11a Cryptococcosis
2.12 Ejaculatory duct
2.12a GIST
2.13 Gleason grading
2.13.1 grades 1 or 2
2.13.2 grade 3
2.13.3 grade 4
2.13.4 grade 5
2.14 Granulomatous prostatitis and foreign body granulomas
2.14.1 BCG
2.14.2 Cholesterol
2.14.3 Idiopathic (nonspecific)
2.14.4 Macroplastique
2.14.5 Post-TUR
2.14.6 Teflon
2.14.7 Xanthogranulomatous
HGPIN (See high-grade prostatic intraepithelial neoplasia)
2.16 High-grade prostatic intraepithelial neoplasia (HGPIN)
2.16.1 Atypical (atypical glands adjacent to HGPIN)
2.16a Histology
2.16a.1 Central zone
2.17 Hormonal-induced changes
2.17.1 In normal glands
2.17.2 In carcinoma cells
2.18 Infarct
2.19 Luminal cells
2.20 Lymphoma
2.21 Malakoplakia
2.22 Mesonephric remnants
2.23 Metaplasia
2.23.1 Urothelial
2.23.2 Squamous
2.23.3 Mucin cell
2.23.4 Nephrogenic
2.24 Metastases from the prostate (or secondary involvement to the prostate)
2.24.1 metastasis to lymph nodes
2.24.2 metastasis to bone marrow
2.24.3 metastasis to scrotal skin
2.24.4 metastasis to the testis
2.24.5 metastasis to a hemangioma of the liver
2.24.6 metastasis to the thyroid
2.24.7 metastasis to vertebrae and pelvis
2.24.8 involvement of the prostate on needle biopsy from adenocarcinoma of the rectumsigmoid
2.25 Nodular prostatic hyperplasia (benign prostatic hyperplasia)
2.26 Neuroendocrine cells
2.26a Paracoccidioidomycosis
2.26a.1 and adenocarcinoma
2.26b Paraganglia
2.27 Radiation-induced changes in vessels, stroma, carcinoma cells or normal acini
2.28 Sarcoma
2.28.1 Stromal
2.28.2 Embryonal rhabdomiosarcoma
2.28.2.1 Following radiotherapy and chemotherapy
2.28.3 Leiomyosarcoma
2.29 Secondary involvement (See Metastasis)
2.29a Schistosomiasis (S. mansoni)
2.29a.1 and adenocarcinoma
2.30 Sclerosing adenosis
2.31 Staging in radical prostatectomy
2.31.1 pT3a (extraprostatic extension)
2.31.1.1 radical prostatectomy
2.31.1.2 needle prostatic biopsy
2.31.2 pT3b (seminal vesicle invasion)
2.32 Stromal tumors of uncertain malignant potential
2.32.1 degenerative atypia type
2.32.2 hypercellular with fusiform cells with eosinophilic cytoplasm
2.32.3 hypercellular phyllodes-like stroma
2.32.4 hypercellular myxoid stroma
2.33 STUMP (See stromal tumors of uncertain malignant potential)
2.34 Suspicious but not diagnostic of carcinoma
2.35 Verumontanum glands
2.36 Xanthoma