Case Report
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World J Radiol. Apr 28, 2014; 6(4): 125-129
Published online Apr 28, 2014. doi: 10.4329/wjr.v6.i4.125
Psoas muscle metastasis from cervical carcinoma: Correlation and comparison of diagnostic features on FDG-PET/CT and diffusion-weighted MRI
Sandip Basu, Abhishek Mahajan
Sandip Basu, Radiation Medicine Centre, Bhabha Atomic Research Centre, Tata Memorial Hospital Annexe, Parel, Mumbai 400012, India
Abhishek Mahajan, Department of Radiology, Tata Memorial Hospital, Mumbai 400012, India
Author contributions: Basu S and Mahajan A designed the study and wrote the manuscript.
Correspondence to: Dr. Sandip Basu, Radiation Medicine Centre, Bhabha Atomic Research Centre, Tata Memorial Hospital Annexe, Parel, Mumbai 400012, India drsanb@yahoo.com
Telephone: +91-22-24149428 Fax: +91-22-24157098
Received: November 30, 2013
Revised: March 10, 2014
Accepted: March 17, 2014
Published online: April 28, 2014
Processing time: 146 Days and 3.1 Hours
Abstract

Psoas muscle metastasis, though rare, is the commonest site of skeletal muscle involvement in cervical carcinoma. The appropriate clinical management of this condition, particularly of the pain related to malignant psoas syndrome, is still evolving and the diagnostic features on conventional morphological imaging modalities are often non specific, with the differential diagnosis lying between sarcoma, hematoma, and abscess. In this report, a comparison of various morphofunctional imaging modalities was made. Fluorodeoxyglucose-positron emission tomography (FDG-PET)/computed tomography (CT) was the first to suspect disease involvement of the psoas muscle, demonstrating intense FDG uptake (compared with the contralateral muscle), while ultrasound showed heterogeneous echotexture, and magnetic resonance imaging (MRI) showed subtle altered signal intensity in the right psoas muscle. Both anatomical imaging modalities and non contrast CT of the PET-CT examination demonstrated a bulky psoas muscle, without any focal abnormality. On diffusion-weighted imaging of MRI (DWI-MRI), restricted diffusion of the involved muscle was an important observation. The psoas muscle metastatic involvement was proven histopathologically. Thus, enhanced glucose metabolism and restricted diffusion in the newer non-invasive molecular imaging modalities (e.g., PET/CT and DWI-MRI) could serve as valuable adjunctive parameters in diagnosing this entity in the absence of a focal abnormality in the anatomical modalities. In the treatment response monitoring scenario, FDG-PET/CT demonstrated near complete resolution following administration of 3 cycles of systemic chemotherapy and local external radiotherapy.

Keywords: Psoas muscle metastasis; Carcinoma cervix; Fludeoxyglucose-positron emission tomography/Computed tomography; Diffusion weighted magnetic resonance imaging

Core tip: Psoas muscle metastasis, though unusual, forms the commonest site of skeletal muscle involvement in cervical carcinoma. The present communication describes the comparative diagnostic features of this relatively unusual but important entity on newer non-invasive molecular imaging modalities such as fluorodeoxyglucose-positron emission tomography/computed tomography (CT) and diffusion-weighted imaging of magnetic resonance imaging (MRI) as well as the conventional imaging modalities (e.g., ultrasound, CT and MRI). Currently, there is a lack of characteristic diagnostic imaging features on conventional imaging modalities which have been nonspecific in this domain, and the differential diagnosis includes sarcoma, hematoma, and abscess, thus the newer molecular imaging approaches need critical exploration and comparison.