Differential diagnosis of solid renal tumors by MRI. Comparison of in situ relaxation times measured with a 0.1 T imager and histological findings.
The T1 and T2 of kidneys in 5 normal volunteers and 27 patients with renal tumors were evaluated preoperatively using a magnetic resonance imager with a 0.1 T resistive electromagnet, and the T1 and T2 of the renal tumors were compared with the pathological findings: (i) the T1 and T2 of the normal renal medulla were longer than those of the normal renal cortex and psoas muscle; (ii) both T1 and T2 of renal pelvic cancer (RPC) were shorter than those of renal cell cancer (RCC, p < 0.05); (iii) the T2 values of RPC were significantly shorter than those of renal medulla (p < 0.01); (iv) the T1 and T2 of the normal renal cortex of subjects < 50 years old were shorter than those of subjects > or = 50 years old (p < 0.05 and p < 0.01, respectively). These findings suggest that preoperative evaluation of the pathological findings of renal tumors may be possible by calculating the relaxation time using MRI under low magnetic field.
Takeda
M
M
Department of Urology, Niigata University School of Medicine, Japan.
Katayama
Y
Y
Tsutsui
T
T
Komeyama
T
T
Mizusawa
T
T
Saito
K
K
Takahashi
H
H
Tamaki
M
M
Sato
S
S
D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D018207:Angiomyolipoma / Q000175:diagnosis*; D002292:Carcinoma, Renal Cell / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007672:Kidney Cortex / Q000473:pathology; D007679:Kidney Medulla / Q000473:pathology; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000473:pathology; D007682:Kidney Pelvis / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging