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.
Bellin
M F
MF
Department of Radiology, Hôpital Pitié Salpétrière, Paris, France.
Darchen
M A
MA
Hoang
C
C
Bitker
M O
MO
Ourhama
S
S
Attal
M
M
Grellet
J
J
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