Maria Isabel Puig-Povendano, Presenter: Nothing to Disclose

Eva Maria Merino Serra MD, Abstract Co-Author: Nothing to Disclose

David Martinez De La Haza MD, Abstract Co-Author: Nothing to Disclose

Ana Sanchez Marquez MD, Abstract Co-Author: Nothing to Disclose

Eduardo Andia Navarro MD, Abstract Co-Author: Nothing to Disclose

Domenico Fraccalvieri, Abstract Co-Author: Nothing to Disclose

In spite of  improvement in surgical techniques local rectal cancer recurrences are not rare.  Usually the rectal cancer follow up is done with CT but, if suspicion of pelvic tumoral relapse exists and CT findings remain equivocal, patients can be tributaries of  PET-CT. With  this technique false positives ( inflammatory diseases,  previous surgery or radiotherapy, complications like fistulas or haematomas) and  false negatives ( necrotic or mucinous lesions or  recent chemotherapy) can appear . MRI conventional images alone have high accuracy  in detecting recurrences. DWI is able to help especially when they are small, anastomotic or multiples and improves confidence in rule out recurrence. Relapsing tumors restrict diffusion in b 1000 and are hypointenses in  ADC maps, these features allow differential diagnosis with fibrotic or inflammatory changes. False positive are possible in mucinous tumor relapses. Surgical contraindications: proximal sacral invasion (above S2-S3), sciatic notch extension, involvement of nervous roots (S1, S2) or vascular encasement can be evaluated with conventional sequences.

 . MRI rectal recurrence findings. . DWI in detection and diferential diagnosis of recurrences. Correlation with equivocal lesions at  PET-CT. . MRI planning surgery. Surgical contraindications.

http://abstract.rsna.org/uploads/2014/14015041/14015041_3eo9.pdf

Puig-Povendano, M, Merino Serra, E, Martinez De La Haza, D, Sanchez Marquez, A, Andia Navarro, E, Fraccalvieri, D, Rectal Cancer MRI: How DWI Can Help Diagnosis in Local Recurrences.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14015041.html