Simini Boards Cast
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🧠 Flashcard-style recaps + board-style questions
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Simini Boards Cast
Chapter 116 - Part E: When the Reservoir Turns Malignant: Masses, Trigones, and Surgical Limits
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In this BoardsCast episode, we finish Tobias Chapter 116 — Bladder with the truth that changes everything about bladder cancer:
Bladder cancer isn’t dangerous just because it grows. It’s dangerous because of where it grows.
This episode establishes the governing rule:
Tumor location beats tumor size.
We break down why the trigone is the most leveraged real estate in the bladder: it’s the rigid, crowded “plumbing hub” where both ureters enter, the urethra exits, and the neurovascular supply converges. A small mass here threatens the entire system—renal drainage, continence, and outflow—far faster than a larger tumor growing in the apex/body.
We focus on transitional cell carcinoma (TCC): the most common bladder tumor in dogs and cats, malignant and invasive, with a strong predilection for the trigone. That’s why it’s often not surgically resectable with clean margins without destroying function.
You’ll learn:
- Why TCC mimics routine lower urinary disease (hematuria, dysuria, pollakiuria), and diagnosis is often delayed
- Why secondary UTIs are common: incomplete emptying + devitalized tissue + dead-space mechanics
- How to map the battlefield: ultrasound + contrast studies to define trigonal/urethral/ureteral involvement
- The biopsy trap: avoid percutaneous sampling when possible due to tumor seeding risk; prefer catheter/cystoscopy-guided approaches
- The real endgame: when a cure isn’t realistic, the mission becomes to preserve flow (stents, cystostomy) and maintain quality of life
Key takeaway: Ask “Is this tumor occupying the bladder… or controlling the system?”
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