Leiomyoma of the Seminal Vesicle Mimicking Tumoral Extension of Prostatic Carcinoma

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Leiomyoma of the seminal vesicle is an extremely rare tumour. The diagnosis of this entity is important when it co-exists with prostatic carcinoma, since it can simulate tumour extension from prostate or bladder cancer on MR imaging and lead to overstaging. In this report, we describe a 74-year-old man with a leiomyoma of the seminal vesicle that mimics tumour extension from co-existent prostatic cancer on T2-weighted MR imaging. To our knowledge, this is the first description of imaging findings of concurrent leiomyoma of the seminal vesicle and prostatic carcinoma.