Urethral calculi are an uncommon type of urolithiasis, accounting for ~1% of all urinary tract stones.


They almost all occur in males  with two peak incidences - one in childhood and the other at 40 years .

Clinical presentation

Most commonly acute lower urinary tract symptoms and/or urinary retention.


Urethral calculi are most commonly calcium oxalate (~85%) and can be either :


Most impact in the prostatic urethra although ~40% (range 30-50%) are found in the anterior urethra .

Radiographic features

Almost all (98-100%) of urethral stones are reported to be radiopaque  but most are small and only faintly radiopaque and up to 60% will be missed .

Differential diagnosis

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