title: Can outer-to-outer diameter be used alone in diagnosing appendicitis on 128-slice MDCT?
abstract: OBJECTIVE
  To assess the frequency of visualization, position and diameter of normal appendix on 128-slice multidetector computed tomography (MDCT) in adult population.
  
  
  METHODS
  Retrospective cross sectional study conducted at Radiology Department, Dallah Hospital, Riyadh, Saudi Arabia from March 2013 to October 2013. Non-enhanced computed tomography scans of abdomen and pelvis of 98 patients presenting with hematuria (not associated with abdominal pain, fever or colonic disease) were reviewed by two radiologists, blinded to patient history. The study group included 55 females and 43 males with overall mean age of 54.7 years (range 21 to 94 years). The coronal reformatted images were reviewed in addition to the axial images. The frequency of visualization of appendix was recorded with assessment of position, diameter and luminal contents.
  
  
  RESULTS
  The appendix was recorded as definitely visualized in 99% of patients and mean outer-to-outer diameter of the appendix was 5.6 ± 1.3 mm (range 3.0-11.0 mm).
  
  
  CONCLUSIONS
  MDCT with its multiplanar reformation display is extremely useful for visualization of normal appendix. The normal appendix is very variable in its position and diameter. In the absence of other signs, the diagnosis of acute appendix should not be made solely on outer-to-outer appendiceal diameter.
authors.affiliation: Jamal Yaqoob, Muhammad Idris, Muhammad Shahbaz Alam, Department of Radiology, Dallah Hospital, Riyadh 11652, Kingdom of Saudi Arabia.
authors.forename: Jamal
authors.initials: J
authors.lastname: Yaqoob
authors.affiliation: Jamal Yaqoob, Muhammad Idris, Muhammad Shahbaz Alam, Department of Radiology, Dallah Hospital, Riyadh 11652, Kingdom of Saudi Arabia.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Idris
authors.affiliation: Jamal Yaqoob, Muhammad Idris, Muhammad Shahbaz Alam, Department of Radiology, Dallah Hospital, Riyadh 11652, Kingdom of Saudi Arabia.
authors.forename: Muhammad Shahbaz
authors.initials: MS
authors.lastname: Alam
authors.affiliation: Jamal Yaqoob, Muhammad Idris, Muhammad Shahbaz Alam, Department of Radiology, Dallah Hospital, Riyadh 11652, Kingdom of Saudi Arabia.
authors.forename: Nazia
authors.initials: N
authors.lastname: Kashif
keywords: Appendiceal enlargement; Computed tomography; Multidetector computed tomography; Normal appendix