title: F-18 FDG imaging of an asymptomatic sacrococcygeal pilonidal sinus in a patient with malignant disease.
abstract: This case illustrates a pitfall associated with F-18 FDG imaging. We present the images of a 57-year-old woman with non-Hodgkin's lymphoma that shows intense accumulation of F-18 FDG in a sacrococcygeal pilonidal sinus that could indicate a lymphomatous involvement from a primary disease. MRI showed a well-defined sinus tract from skin to the sacrococcygeal region corresponding to the F-18 FDG uptake. She did not have any symptoms of a sacrococcygeal pilonidal sinus such as discharge, swelling or pain. There was no visible opening of the sinus tract on the skin. Pilonidal sinus is commonly a hair-containing sinus or abscess in the sacrococcygeal area. Hair acts as a foreign body causing an inflammatory reaction.
authors: Department of Nuclear Medicine, Osmangazi University Faculty of Medicine, Eskişehir, Turkey. ilknur_ak@yahoo.com
authors: Ilknur
authors: I
authors: Ak
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008875:Middle Aged; D009382:Neoplasms, Unknown Primary / Q000000981:diagnostic imaging*; D010386:Pelvic Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D010864:Pilonidal Sinus / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D012445:Sacrococcygeal Region / Q000000981:diagnostic imaging*; D012447:Sacrum / Q000000981:diagnostic imaging*
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18