All of the following statements are true about Gleason score, except:

Used for grading prostate cancer

Higher the score, poorer the prognosis

Which of the following is true about bone metastasis?

Most common secondary tumor in females is from breast

Higher serum levels of alkaline phosphatase

Bone metastases are often symptomatic

Prostate cancer produces only lytic lesions

Screening of prostate cancer is commonly done by

DRE (digital rectal exam) & PSA

Most common site of osteochondritis dissecans?

Lateral part of the medial femoral condyle

Medial part of the medial femoral condyle

Lateral part of the lateral femoral condyle

Medial part of the lateral femoral condyle

Identify the stain shown in the liver section.

Gordon and Sweet's reticulin stain

Prostate Pathology for FMGE: High-Yield Pathology Lessons

Prostate Anatomy & Histo - Gland Essentials

Zones: Key anatomical regions.
- Peripheral Zone (PZ): Largest, posterior.
- Central Zone (CZ): Surrounds ejaculatory ducts.
- Transitional Zone (TZ): Surrounds urethra; site of BPH.
- 📌 Mnemonic: "Pee Cee Tee" (Peripheral, Central, Transitional).
Epithelial Cells: Comprises basal, luminal, and neuroendocrine types.
- Basal cells: Outer layer; p63+, HMWCK+.
- Luminal (secretory) cells: Inner layer; PSA+, PAP+.
- Neuroendocrine cells: Scattered; chromogranin A+.
Corpora Amylacea: Eosinophilic, laminated concretions in acini; ↑ with age.

Prostate zonal anatomy diagram

⭐ The peripheral zone is the most common site for prostate cancer (approx. 70%).

Prostatitis - Inflamed Gland

Inflammation of the prostate gland, categorized by etiology and clinical presentation.

Type	Etiology	Key Clinical Features	Histology
Acute Bacterial	E. coli (most common), other gram-negatives	Fever, chills, dysuria, tender, boggy prostate	Neutrophils in glands, stromal edema, hyperemia
Chronic Bacterial	Recurrent UTIs, E. coli	Recurrent bacteriuria, pelvic/perineal pain, dysuria	Lymphocytes, plasma cells, macrophages
Chronic Abacterial / CPPS	Unknown (most common type)	Pelvic pain >3 months, voiding symptoms, no uropathogen	Lymphocytes, may be normal
Granulomatous	Post-BCG therapy, post-TURP, fungal, idiopathic	Variable; may mimic carcinoma	Epithelioid granulomas, giant cells, lymphocytes

Granulomatous prostatitis with giant cells

BPH & PIN - Benign Growths

Benign Prostatic Hyperplasia (BPH):
- Common in older men; Dihydrotestosterone (DHT)-driven.
- Zone: Transitional.
- Histo: Nodular stromal & glandular hyperplasia.
- Clinical: Lower Urinary Tract Symptoms (LUTS) (nocturia, weak stream), smooth firm enlarged prostate.
- Complications: UTI, hydronephrosis, retention, calculi.
Prostatic Intraepithelial Neoplasia (PIN):
- High-Grade PIN (HGPIN) is precursor to prostate adenocarcinoma.
- Zone: Peripheral (typically).
- Histo: Cytological atypia (prominent nucleoli, nuclear hyperchromasia), intact basal cell layer (p63+).

Comparison: BPH vs HGPIN

Feature	BPH	HGPIN
Zone	Transitional (periurethral)	Peripheral (predominantly)
Pathogenesis	DHT-driven hyperplasia (stroma, glands)	Precursor to cancer; atypia
Key Histo	Nodular hyperplasia (glands, stroma)	Atypia, prominent nucleoli, intact basal cells (p63+)
Clinical Signif.	LUTS, obstruction, complications	↑ Cancer risk; surveillance

⭐ Benign Prostatic Hyperplasia (BPH) characteristically arises in the transitional zone of the prostate.

Prostate Cancer - Malignant Threat

Type & Location: Adenocarcinoma, most common prostatic cancer; typically arises in peripheral zone.
Key Risk Factors: Advanced age (↑Age), African-American race, positive family history (BRCA2 mutations).
PSA:
- Serum >4 ng/mL suspicious.
- Also ↑ in BPH/prostatitis.
- ↓free/total PSA ratio (<0.15) more indicative of cancer.
Gleason Score:
- Architectural patterns 1-5 (well to poorly differentiated).
- Sum of 2 most common (e.g., 3+4=7).
- Higher score = worse prognosis.
Histopathology: Perineural invasion is a common finding and hallmark of malignancy.
Metastasis: Osteoblastic (bone-forming) metastases, often to lumbar vertebrae. 📌 Prostate = Produces Bone.

⭐ Prostate cancer typically causes osteoblastic (bone-forming) metastases, particularly to the lumbar spine.

Prostate adenocarcinoma Gleason patterns

High‑Yield Points - ⚡ Biggest Takeaways

Prostatic Intraepithelial Neoplasia (PIN) is a significant precursor to prostate adenocarcinoma.

The Gleason score is crucial for grading prostate adenocarcinoma, impacting prognosis and treatment.

Prostate cancer most commonly arises in the peripheral zone of the prostate.

PSA (Prostate-Specific Antigen) is a valuable tumor marker, though not specific for cancer.

Benign Prostatic Hyperplasia (BPH) typically affects the transitional zone, leading to urinary obstruction.

Prostate cancer frequently metastasizes to bone, characteristically forming osteoblastic lesions.

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