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Lipomatous Hypertrophy of the Interatrial Septum: Increased Uptake on FDG PET

Chieh-Min Fan1, Alan J. Fischman1, Boon Han Kwek1,2, Suhny Abbara1 and Suzanne L. Aquino1

1 Department of Radiology, GRB-290, Massachusetts General Hospital, 55 Fruit St., Boston, MA 02114.
2 Present address: Department of Radiology, Singapore General Hospital, Singapore.



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  		Fig. 1A. —71-year-old woman with squamous cell carcinoma of right lower lobe. Axial CT scan (A), T1-weighted MR image (B), and T1-weighted MR image with fat-saturation (C) show lipomatous hypertrophy of the interatrial septum (LHIS) (arrows). Note fat density of LHIS on CT scan and signal dropout within lesion on fat-suppressed MR image.

 


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  		Fig. 1B. —71-year-old woman with squamous cell carcinoma of right lower lobe. Axial CT scan (A), T1-weighted MR image (B), and T1-weighted MR image with fat-saturation (C) show lipomatous hypertrophy of the interatrial septum (LHIS) (arrows). Note fat density of LHIS on CT scan and signal dropout within lesion on fat-suppressed MR image.

 


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  		Fig. 1C. —71-year-old woman with squamous cell carcinoma of right lower lobe. Axial CT scan (A), T1-weighted MR image (B), and T1-weighted MR image with fat-saturation (C) show lipomatous hypertrophy of the interatrial septum (LHIS) (arrows). Note fat density of LHIS on CT scan and signal dropout within lesion on fat-suppressed MR image.

 


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  		Fig. 1D. —71-year-old woman with squamous cell carcinoma of right lower lobe. Axial FDG PET image (D) and axial PET/CT fusion image (E) reveal increased uptake within LHIS.

 


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  		Fig. 1E. —71-year-old woman with squamous cell carcinoma of right lower lobe. Axial FDG PET image (D) and axial PET/CT fusion image (E) reveal increased uptake within LHIS.

 


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  		Fig. 2A. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Serial CT scans over 6-year period confirm stability of lipomatous hypertrophy of the interatrial septum (LHIS). Note characteristic appearance of LHIS on June 2003 examination image (B) and bilobed fatty expansion of interatrial septum (white arrows) that spares fossa ovalis (black arrow, B).

 


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  		Fig. 2B. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Serial CT scans over 6-year period confirm stability of lipomatous hypertrophy of the interatrial septum (LHIS). Note characteristic appearance of LHIS on June 2003 examination image (B) and bilobed fatty expansion of interatrial septum (white arrows) that spares fossa ovalis (black arrow, B).

 


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[in a new window]
  		Fig. 2C. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Serial CT scans over 6-year period confirm stability of lipomatous hypertrophy of the interatrial septum (LHIS). Note characteristic appearance of LHIS on June 2003 examination image (B) and bilobed fatty expansion of interatrial septum (white arrows) that spares fossa ovalis (black arrow, B).

 


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  		Fig. 2D. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Coronal CT scan (D), FDG PET image (E), and PET/CT fusion image (F) depict increased FDG uptake in LHIS.

 


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  		Fig. 2E. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Coronal CT scan (D), FDG PET image (E), and PET/CT fusion image (F) depict increased FDG uptake in LHIS.

 


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  		Fig. 2F. —69-year-old woman with non-Hodgkin's lymphoma of left tibia. Coronal CT scan (D), FDG PET image (E), and PET/CT fusion image (F) depict increased FDG uptake in LHIS.

 

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