title: [Extraosseous abnormalities and artifacts in skeletal scintigraphy].
abstract: OBJECTIVE
  to specify frequency, patterns and diagnostic significance of extraosseous soft tissue findings in 99mTc-pyrophosphate skeletal scintigraphy.
  
  
  METHODS
  Results of skeletal scintigraphy from 1060 patients (447 men, 613 women) were analyzed. Scanning in "whole body" mode started in 3-4 hours after 740 MBq of radiotracer activity intravenous administration, and performed in anterior and posterior projections in continuous table motion mode at rate of 6-8 cm per minute. Single photon emission computed tomography/computed tomography (SPECT/CT) was additionally performed when necessary.
  
  
  RESULTS
  Extraosseous scintigraphic findings were discovered in 161 (15.2%) patients, they can be divided into three categories: nephrourological (7.7%), soft tissue (5.4%) and artifacts (2.1%). First category included anatomical and functional changes in the urinary system (kidney location anomalies and nonobstructive uropathies). SPECT/CT was performed to differentiate calycostasis in the projection of the upper group of calyces and focal changes of the ribs. Soft tissue extrarenal findings included diffuse or focal RP hyperfixation within breasts (29 patients), thyroid glands (15), myocardium (5), scrotum (4) and abdominal cavity (4). Symmetrical increased RP accumulation in breast or thyroid lobes was accepted as normal. Pathologic soft tissue findings in 11 patients were verified by history or instrumental data: breast cancer (2), testicular cancer (1), nodular goiter (2), uterine fibroids (2), primary cancer with liver metastases (1), association of "hot kidney" phenomenon with chemotherapy (2), and "superscan" phenomenon with myelofibrosis (1). Causes of radiotracer artifacts in the liver and spleen (14) were of radiopharmaceutical factors, in axillary lymph node (7)--partially infiltrative radiopharmaceuticals administration, in the colon (1)--previous myocardial perfusion scintigraphy.
  
  
  CONCLUSIONS
  Analysis and interpretation of abnormal extraosseous findings in skeletal scintigraphy is an essential component of additional diagnostic information, that can influence subsequent diagnostic and therapeutic tactics.
authors: S P
authors: SP
authors: Mironov
authors: A A
authors: AA
authors: Ansheles
authors: D N
authors: DN
authors: Shulgin
authors: V B
authors: VB
authors: Sergienko
mesh_terms: D000328:Adult; D016477:Artifacts; D001842:Bone and Bones / Q000000981:diagnostic imaging*; D001943:Breast Neoplasms / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D033162:Incidental Findings; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011877:Radionuclide Imaging / Q000379:methods*; D019275:Radiopharmaceuticals / Q000494:pharmacology; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging; D016698:Technetium Tc 99m Pyrophosphate / Q000494:pharmacology*; D013959:Thyroid Diseases / Q000000981:diagnostic imaging; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*; D014565:Urogenital Neoplasms / Q000000981:diagnostic imaging
chemical_list: D019275:Radiopharmaceuticals; D016698:Technetium Tc 99m Pyrophosphate