Prostatomegaly

Last revised by Dr Bálint Botz on 23 Jun 2022

Prostatomegaly is a term used to generally describe enlargement of the prostate gland from whatever cause. Usually, the prostate is considered enlarged on imaging when its volume measures beyond 30 cc (mL). 

The term prostatomegaly is often used interchangeably with benign prostatic hyperplasia (BPH). Strictly speaking though, prostatomegaly refers to any cause of prostatic enlargement of which BPH is a common cause.

Prostatomegaly is a general descriptive term and causes are varied:

Prostate volume is significantly influenced by age, with one study of healthy caucasian participants showing a gradual increase of mean prostate volume from 24 to 38 mL between the age groups of 50-54 years and those over 75 years 2

The volume of the prostate can be estimated on ultrasound, CT and MRI with the following formula 1:

  • width x height x length x 0.523

The result is preferably expressed in milliliters (mL) although it is still common to see "cc (cubic centimeters)" used in reports.

Please see specific causes for further information. 

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3
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  • Case 4: causing chronic bladder outlet obstruction
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