**Question:** Consider the following conditions: 1) Urinary flow rate less than 10 cc/s, 2) Residual urine volume > 100 cc, 3) Serum level of prostatic specific antigen > 10 μg/L, and 4) Trabeculated urinary bladder. Which of the above are indications of Transurethral Resection of Prostate (TRUP) for Benign Prostatic Hyperplasia (BPH)?

**Core Concept:**

Transurethral Resection of Prostate (TRUP) is a surgical procedure used to treat Benign Prostatic Hyperplasia (BPH), a common condition affecting older men characterized by the hyperplasia of the prostate gland, leading to obstructive uropathy and lower urinary tract symptoms. The main indications for TRUP include:

1. Urinary flow rate (Qmax) less than 10 cm³/s: A low urinary flow rate indicates significant obstruction of the urethra due to enlarged prostate, which is a common feature of BPH.
2. Residual urine volume (RUV) greater than 100 cc: A high urine retention after voiding indicates incomplete emptying of the bladder, commonly seen in BPH patients due to the obstructive effect of the enlarged prostate.
3. Serum level of prostatic specific antigen (PSA) greater than 10 μg/L: Elevated PSA levels are often associated with prostate cancer, not BPH. However, in cases where PSA levels are elevated with no evidence of prostate cancer on biopsy, it may suggest BPH.
4. Trabeculated urinary bladder (trabeculae are folds or ridges in the bladder wall): A trabeculated bladder may be a result of obstruction caused by an enlarged prostate, which can lead to detrusor muscle hypertrophy and contractility dysfunction in BPH patients.

**Why the Correct Answers are Right:**

The correct answers (A and D) are selected based on the clinical presentation and laboratory results typically seen in patients with Benign Prostatic Hyperplasia (BPH). A low urinary flow rate (Qmax) and high residual urine volume (RUV) are strong indicators of obstructive uropathy due to the obstructive effects of an enlarged prostate gland in BPH patients.

**Why the Incorrect Answers are Wrong:**

The incorrect answers (B and C) are not appropriate indications for TRUP in BPH patients:

- Elevated serum PSA levels (option B) are often associated with prostate cancer, not BPH. However, in cases with elevated PSA levels without cancer evidence, it may suggest BPH. In this context, it is important to perform a prostate biopsy for definitive diagnosis.
- Trabeculated bladder (option D) is not a specific diagnostic criterion for BPH. A trabeculated bladder can result from bladder outlet obstruction due to BPH, leading to detrusor muscle hypertrophy and contractility dysfunction. However, the presence of trabeculae alone is not sufficient to justify TRUP for BPH.

**Why Option A is Correct:**

Option A addresses both the clinical manifestations and the underlying path