Time-course changes in the liver of biliary atresia patients on magnetic resonance imaging.
BACKGROUND
Using magnetic resonance imaging (MRI), changes in the livers of postoperative biliary atresia (BA) patients were investigated.


METHODS
Periodic MRI was performed in 32 postoperative BA patients. The findings were evaluated by calculating the near-normal liver tissue area that corresponded with normal- or high-signal regions on T1-weighted imaging. The patients were divided into three groups based on the extent of near-normal liver tissue on the final MRI: group A, n = 14; group B, n = 13; and group C, n = 5, included patients with >40%, 20-40%, and <20% area of near-normal liver tissue, respectively. The relationship among the macroscopic and histological findings in the liver at orthotopic living donor liver transplantation (OLDLT), patient outcomes, and MRI findings were investigated.


RESULTS
In group A, 11 patients had no evidence of liver dysfunction. In group B, six patients either had undergone or were awaiting OLDLT. In group C, all patients had undergone OLDLT. All patients had either adequate or impaired bile drainage in each liver segment. The segmental changes corresponded with the liver architecture at OLDLT. The changes could be evaluated on MRI at 1-2 years after surgery.


CONCLUSIONS
Adequate and restricted areas of liver tissue with near-normal structure were indicative of good and poor prognoses, respectively. Shortly after portoenterostomy, these segmental changes occurred and/or developed in each liver segment and could be detected on MRI. It is emphasized that patients with >40% area of near-normal liver architecture at the initial stages did not require OLDLT, while those with <20% area did require OLDLT.
Takahashi
Atsushi
A
Department of Surgery, Gunma Children's Medical Center, Gunma, Japan. takaatsu@med.gunma-u.ac.jp
Hatakeyama
Shin-Itsu
SI
Kuroiwa
Minoru
M
Suzuki
Norio
N
Toki
Fumiaki
F
Suzuki
Makoto
M
Suehiro
Taketoshi
T
Shimura
Tatsuo
T
Kuwano
Hiroyuki
H
D001656:Biliary Atresia / Q000473:pathology* / Q000601:surgery; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008099:Liver / Q000473:pathology*; D016031:Liver Transplantation; D008279:Magnetic Resonance Imaging