Abstract
Background: We examined the incidence and natural history of simple renal cysts found by ultrasonography (US) in patients referred for asymptomatic microscopic hematuria. Methods: Among the 906 patients aged 18-78 years, 743 patients who had undergone US were included in the present study. The natural history of simple renal cysts was investigated in 55 patients who underwent periodical US examinations for more than 3 years. Results: The incidence of simple renal cysts was 4.3% for ages 29 years or younger, 15.3% for ages 30-39, 21.8% for ages 40-49, 23.3% for ages 50-59 and 32.6% for ages 60 years or older; thus the incidence increased in older age groups (P = 0.0005 for men, P = 0.0020 for women). Men tended to have a higher incidence than women. The degree of hematuria did not influence the incidence of renal cysts (P = 0.9044). The annual growth rate of the mean maximum diameter was 4.2% during a 3-year follow-up period in 55 patients and 5.1% during a 6-year follow-up in 31 patients. Conclusion: Since the diameter of a renal cyst may increase by 5% annually, the diameter of the cyst may increase by 1.6 times in 10 years. The scheduling of follow-up examinations depends on the size at the time of disclosure, the effects on calyceal systems, or the suspicion of a concurrent malignant disease. However, the most simple renal cysts may be followed-up at an interval of more than 10 years, once a diagnosis has been established.
| Original language | English |
|---|---|
| Pages (from-to) | 63-67 |
| Number of pages | 5 |
| Journal | International Journal of Urology |
| Volume | 10 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2003 Feb 1 |
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Keywords
- Microscopic hematuria
- Simple renal cyst
- Ultrasonography
ASJC Scopus subject areas
- Urology
Cite this
Incidence and growth pattern of simple cysts of the kidney in patients with asymptomatic microscopic hematuria. / Marumo, Ken; Horiguchi, Yutaka; Nakagawa, Ken; Oya, Mototsugu; Ohigashi, Takashi; Asakura, Hirotaka; Nakashima, Jun; Murai, Masaru.
In: International Journal of Urology, Vol. 10, No. 2, 01.02.2003, p. 63-67.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Incidence and growth pattern of simple cysts of the kidney in patients with asymptomatic microscopic hematuria
AU - Marumo, Ken
AU - Horiguchi, Yutaka
AU - Nakagawa, Ken
AU - Oya, Mototsugu
AU - Ohigashi, Takashi
AU - Asakura, Hirotaka
AU - Nakashima, Jun
AU - Murai, Masaru
PY - 2003/2/1
Y1 - 2003/2/1
N2 - Background: We examined the incidence and natural history of simple renal cysts found by ultrasonography (US) in patients referred for asymptomatic microscopic hematuria. Methods: Among the 906 patients aged 18-78 years, 743 patients who had undergone US were included in the present study. The natural history of simple renal cysts was investigated in 55 patients who underwent periodical US examinations for more than 3 years. Results: The incidence of simple renal cysts was 4.3% for ages 29 years or younger, 15.3% for ages 30-39, 21.8% for ages 40-49, 23.3% for ages 50-59 and 32.6% for ages 60 years or older; thus the incidence increased in older age groups (P = 0.0005 for men, P = 0.0020 for women). Men tended to have a higher incidence than women. The degree of hematuria did not influence the incidence of renal cysts (P = 0.9044). The annual growth rate of the mean maximum diameter was 4.2% during a 3-year follow-up period in 55 patients and 5.1% during a 6-year follow-up in 31 patients. Conclusion: Since the diameter of a renal cyst may increase by 5% annually, the diameter of the cyst may increase by 1.6 times in 10 years. The scheduling of follow-up examinations depends on the size at the time of disclosure, the effects on calyceal systems, or the suspicion of a concurrent malignant disease. However, the most simple renal cysts may be followed-up at an interval of more than 10 years, once a diagnosis has been established.
AB - Background: We examined the incidence and natural history of simple renal cysts found by ultrasonography (US) in patients referred for asymptomatic microscopic hematuria. Methods: Among the 906 patients aged 18-78 years, 743 patients who had undergone US were included in the present study. The natural history of simple renal cysts was investigated in 55 patients who underwent periodical US examinations for more than 3 years. Results: The incidence of simple renal cysts was 4.3% for ages 29 years or younger, 15.3% for ages 30-39, 21.8% for ages 40-49, 23.3% for ages 50-59 and 32.6% for ages 60 years or older; thus the incidence increased in older age groups (P = 0.0005 for men, P = 0.0020 for women). Men tended to have a higher incidence than women. The degree of hematuria did not influence the incidence of renal cysts (P = 0.9044). The annual growth rate of the mean maximum diameter was 4.2% during a 3-year follow-up period in 55 patients and 5.1% during a 6-year follow-up in 31 patients. Conclusion: Since the diameter of a renal cyst may increase by 5% annually, the diameter of the cyst may increase by 1.6 times in 10 years. The scheduling of follow-up examinations depends on the size at the time of disclosure, the effects on calyceal systems, or the suspicion of a concurrent malignant disease. However, the most simple renal cysts may be followed-up at an interval of more than 10 years, once a diagnosis has been established.
KW - Microscopic hematuria
KW - Simple renal cyst
KW - Ultrasonography
UR - http://www.scopus.com/inward/record.url?scp=0037307402&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037307402&partnerID=8YFLogxK
U2 - 10.1046/j.1442-2042.2003.00577.x
DO - 10.1046/j.1442-2042.2003.00577.x
M3 - Article
C2 - 12588599
AN - SCOPUS:0037307402
VL - 10
SP - 63
EP - 67
JO - International Journal of Urology
JF - International Journal of Urology
SN - 0919-8172
IS - 2
ER -