Rectal malacoplakia in renal transplantation: MR features.
This report describes the CT and MRI features of rectal malacoplakia in a renal transplant recipient. The lesion appeared strongly hyperdense (105 HU) on unenhanced CT and demonstrated hypointense signal on T1- and T2-weighted MR imaging with slight homogeneous enhancement after gadolinium injection. These characteristics distinguish this lesion from other more common neoplastic, inflammatory rectal lesions that are typically isointense on T1-weighted imaging and enhance variably after gadolinium injection. Characteristic intracytoplasmic siderocalcific spherules in malacoplakia can produce suggestive features on unenhanced CT and MRI.
Department of Radiology, Hôpital Pitié Salpétrière, Paris, France.
M F
MF
Bellin
M A
MA
Darchen
C
C
Hoang
M O
MO
Bitker
S
S
Ourhama
M
M
Attal
J
J
Grellet
D003108:Colonic Diseases / Q000175:diagnosis / Q000473:pathology; D003287:Contrast Media; D003937:Diagnosis, Differential; D005682:Gadolinium; D006801:Humans; D007089:Image Enhancement; D007413:Intestinal Mucosa / Q000473:pathology; D016030:Kidney Transplantation; D008279:Magnetic Resonance Imaging; D008287:Malacoplakia / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed
D003287:Contrast Media; D005682:Gadolinium