This presentation covers the grossing rounds procedure for a cystoprostatectomy specimen, typically removed due to bladder cancer. The session begins with a review of the external and internal anatomy, including the proper orientation of the bladder, prostate, and seminal vesicles. Two methods for opening and fixing the specimen—formalin inflation via catheter and the anterior Y-incision—are detailed, emphasizing the need to preserve margins. The core of the talk explores the pathology, risk factors (notably tobacco smoking for urothelial carcinoma and schistosomiasis for squamous cell carcinoma), and gross appearance of the main bladder cancer types. Finally, a comprehensive guide to grossing is provided, detailing necessary measurements, margin assessment, specific tips for identifying and sectioning ureters, and the required Apex-to-Base sectioning protocol for the prostate gland. The presentation concludes with an overview of TNM staging classifications (T, N, and M) and key prognostic factors.
Cystoprostatectomy Grossing Rounds
0:38 Specimen Identification: The specimen is identified as a cystoprostatectomy, including the bladder, prostate, prostatic urethra, seminal vesicles, ureters, and perivisical soft tissue.
1:18 External Anatomy and Orientation: Critical anatomical features for orientation include the bladder (superior), prostate (inferior), seminal vesicles (posterior), and the peritoneal reflection forming the rectovesicular pouch (posterior). The anterior surface is typically rough due to resection from the pubic bone.
4:39 Internal Anatomy - The Trigone: The triangular area between the urethral opening and the ureteric orifices is called the trigone. The bladder neck is the most distal/inferior portion, and the dome is the most superior portion.
Inflation: Fill the bladder with formalin via a catheter inserted through the prostatic urethra. Crucially, clamp the catheter distally, not the prostate parenchyma or urethra, to avoid margin disruption. This expands mucosal folds, aiding in finding small lesions.
Y-Incision: An incision made through the anterior aspect, requiring specimen inking beforehand (e.g., blue for right half, black for left half, green for anterior strip) to preserve soft tissue resection margins.
Key Takeaway: The primary goal is to expose the bladder mucosa to formalin for proper fixation (8:02).
8:11 Bladder Cancer Pathology & Epidemiology: Bladder cancer is the fifth most common cancer in Canada.
Urothelial Carcinoma (95%): Most common type. The major risk factor is tobacco smoking (4 to 7 times higher risk) (9:34).
Squamous Cell Carcinoma (Less Common): Not linked to cystitis glandularis. The most common risk factor globally is schistosomiasis (parasitic infection), particularly prevalent in parts of Africa (11:19). Chronic irritation (catheters, calculi) is also a risk factor.
Adenocarcinoma: Arises from the urachus, a remnant of the embryonic allantois (13:21).
14:32 Grossing Steps: Measurements and Findings: Required measurements include 3D dimensions of the bladder and prostate, length/diameter of ureters, and maximum depth of perivisical soft tissue. Main findings must detail the tumor's location, size, gross appearance, depth of invasion, involvement of adjacent organs, and distances to all margins (perivisical, urethral, and ureteric).
18:41 Ureter Sectioning Tips: Ureteric margins are often sutured/stapled (black tie). Identify the ureter by its pale tan-pink, tubular structure and, if possible, its star-shaped lumen (19:33). Avoid cutting a vessel (which will bleed when squeezed). For sectioning, use probes to identify the ureteric orifice and make a clean, longitudinal cut along the probe to show the ureter and the transitional zone with the orifice.
22:30 Prostate Invasion Mechanisms: Bladder cancer can invade the prostate via transurethral mucosal spread, direct invasion from the bladder wall, or extension from the perivisical soft tissue.
23:41 Prostate Sectioning Protocol: The prostate must be sectioned Apex to Base (like a radical prostatectomy) to fully assess for cancer invasion.
The prostate is surgically removed from the bladder neck (24:21).
Apex and Base slices (approx. 0.5 cm thick) are submitted entirely using perpendicular sections (25:34).
Mid-prostate slices (0.3–0.4 cm thick) are submitted in quarters/halves/sixths; if the prostate is large, alternating slices may be used, but the Apex and Base must always be submitted fully (27:17).
T-Stage: Key distinctions are T2a (superficial muscularis propria/inner half) and T2b (deep muscularis propria/outer half). T4a involves the prostatic stroma/seminal vesicles.
N-Stage (Regional Nodes): Includes perivesicle, obturator, iliac, and sacral lymph nodes. Inguinal nodes are not classified as regional (33:49).
35:58 Prognostic Factors: TNM staging is the most accurate predictor. Morphological variants associated with a worse prognosis include micropapillary (the worst), plasmacytoid, and nested urothelial carcinoma (35:53).