A Müllerian duct cyst is a cyst that arises from remnants of the Müllerian duct and is one of the midline cystic masses in the male pelvis.
Müllerian duct cysts usually occur in the 3rd and 4th decades of life (whereas utricle cysts are most often detected in the 1st and 2nd decades).
May be incidental. If large enough, can cause obstructive or irritative urinary symptoms, e.g. hematuria, ejaculatory impairment, or suprapubic or rectal pain 2.
During male fetal development, the paramesonephric (Müllerian) ducts mostly regresses, save for the uppermost and lowermost segments, which contribute to the developing testes (eventually the appendix testes) and prostatic utricle, respectively 5.
Müllerian duct cysts represent focal incomplete duct regression, and thus can arise anywhere along this path of Müllerian duct regression, from scrotum to prostatic utricle. This is in contrast to prostatic utricle cysts, which always arise at the level of the verumontanum and are always in the midline. The embryologic origin also explains why Müllerian duct cysts are larger and often extend superior to the prostate gland, while utricle cysts are usually smaller and are less likely to extend above the prostate gland.
Müllerian duct cysts do not communicate with the urethra.
Müllerian duct cysts are not associated with other abnormalities (utricle cysts are associated with a variety of genitourinary abnormalities).
- may contain pus or hemorrhage if infected
- may contain cancer (i.e. endometrial carcinoma, clear cell carcinoma, or squamous cell carcinoma) with a reported prevalence as high as 3% 2
These are seen on pelvic MRI or ultrasound as midline cystic lesions in the prostate that do not communicate with the urethra.
prostatic utricle cyst - can be very difficult or impossible to distinguish from a Müllerian duct cyst 2
- communicates with urethra
- may contain spermatozoa on aspiration
- prostatic abscess 2
- 1. Nghiem HT, Kellman GM, Sandberg SA et-al. Cystic lesions of the prostate. Radiographics. 1990;10 (4): 635-50. Radiographics (abstract) - Pubmed citation
- 2. Curran S, Akin O, Agildere AM et-al. Endorectal MRI of prostatic and periprostatic cystic lesions and their mimics. AJR Am J Roentgenol. 2007;188 (5): 1373-9. doi:10.2214/AJR.06.0759 - Pubmed citation
- 3. Shebel HM, Farg HM, Kolokythas O et-al. Cysts of the lower male genitourinary tract: embryologic and anatomic considerations and differential diagnosis. Radiographics. 2013;33 (4): 1125-43. doi:10.1148/rg.334125129 - Pubmed citation
- 4. Shabsigh R, Lerner S, Fishman IJ et-al. The role of transrectal ultrasonography in the diagnosis and management of prostatic and seminal vesicle cysts. J. Urol. 1989;141 (5): 1206-9. Pubmed citation
- 5. Glenister TW. The development of the utricle and of the so-called 'middle' or 'median' lobe of the human prostate. (1962) Journal of anatomy. 96: 443-55. Pubmed