Image Courtesy Ashley Davidoff MD Copyright 2010 25078c04bL01.8s Image (c) illustrates the enlarged transitional zone which is where the hyperplasia of BPH takes place. Note that BPH is a misnomer because the enlargement is due to hyperplasia and not hypertrophy. Inward of the peripheral zone is the central zone followed by the transitional zone and finally the anterior fibromuscular layer In this patient who has benign prostatic hypertrophy (BPH) the transitional zone is enlarged due to hyperplasia. Since the prostate gland has 4 major zones and we have accounted for the peripheral zone (pz), three other zones are present. The anterior more hyperdense layer is combination of zones. The posterior zone is canoe shaped is hypodense and represents the peripheral zone. The gland is enlarged based on these measurements. The 70 year old male shows an enlarged prostate 7.2cms in A-P by 6.1cms. Image Courtesy Ashley Davidoff MD Copyright 2010 25078c04L.8s In this patient who has benign prostatic hyperplasia (BPH) the transitional zone is enlarged due to the hyperplasia The anterior region is more hyperdense layer and is combination of zones including the central zone, transition zone and the anterior fibromuscular layer. Two distinct zones are identified because the gland is abnormal.
This calculation reveals a volume of 25ccs which is normal. Thus transverse diameter of 3.5cms is multiplied by A-P dimension of 3.5cms by the craniocaudad dimension of 3.9cms and then by a correction factor of. The volume of this gland is calculated by the formula using a simple prorated ellipsoid formula. By the age of 80, the average prostatic weight is 35-45g.Ī simple prorated ellipsoid formula is commonly used to calculate prostate volume: (anterior-posterior diameter) x (transverse diameter) x (superior-inferior diameter) x Π/6 (approximately 0.52) is accurate and reproducible.įrom a practical point of view in imaging the gland is usually enlarged if the transverse dimension is greater than 4cms. It remains relatively stable in size until the age of 50 when increasing weight of the gland is observed. The prostate normally measures 3 cm in length (height), 4 cm in width (transverse), and 2 cm in depth (anteroposterior dimension). A normal prostate gland weighs about 20g-30g in a 30 year old male. The walnut (d) was close but A-P dimension too large, the plum tomato (f) too round, and the almond (g) too thin in the A-P dimension.Ĭourtesy Ashley Davidoff MD Copyright 2010 99662c04L.81sīy virtue of its small size, it does not allow it to store large amounts of secretions. The kiwi (b) and plum (c) were far larger and A-P dimensions particularly excessively large. After a shopping spree to Russo’s in Newton Massachusetts and some significant research into the true sizes of the fruits and nuts that have been compared to the prostate, it was found that the chestnut (e) is closest to the size of the prostate. The diagram depicts the variety of structures that have been compared to the size of the prostate. In fact after a small experiment involving the purchase of these fine fruits and nuts it was found that the chestnut was closest in size in all dimensions. It has been compared to a small kiwi fruit, small plum, an almond and a chestnut. The size of prostate is smaller than one would imagine.
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