Cricoid ridge ossification mimicking ingested fish bone on plain radiography: prevalence in Singapore.

INTRODUCTION: Ossification of the cricoid ridge mimicking impacted upper aerodigestive tract fish bone has been described in several case reports. We performed this study to determine the prevalence of such ossification in an adult population from Singapore and to identify specific imaging features that may aid in differentiating patients with cricoid ridge ossification from those with an upper aerodigestive tract impacted fish bone. METHODS: We retrospectively evaluated 442 lateral neck radiographs of patients aged 16 years and above that were taken at the adult emergency department at National University Hospital, Singapore, during the four-month period between 1 September 2014 and 31 December 2014. RESULTS: Ossification of the cricoid ridge mimicking fish bone appeared in 3.2% of our adult patients and was more common among patients aged above 40 years (n = 11/227; 4.8%). The ossified cricoid ridge was usually located at the C6 level (n = 9) and had a mean length of 5.5 (range 2-9) mm. CONCLUSION: Ossified cricoid ridges may be misinterpreted on lateral neck radiography as ingested fish bones. While ossification of the cricoid ridge mimicking fish bones is rare, awareness of such ossification would reduce unnecessary further investigations of the upper aerodigestive tract in patients suspected of having an impacted foreign body.

Diagnostic utility of whole body CT scanning in patients with unexplained weight loss.

BACKGROUND: Unexplained weight loss is a non-specific complaint with myriad potential etiologies. Increasingly, whole body CT studies are being performed in patients with unexplained weight loss to exclude organic etiologies such as malignancy. Our study aims to assess the diagnostic accuracy and yield of whole body CT in these patients. METHODS AND MATERIALS: Patients who had a whole body CT scan for investigation of unexplained weight loss as their primary complaint from 2009-2012 were retrospectively reviewed. CT scans were classified into 4 categories: (1) Definite/highly suspicious for underlying organic cause (2) Indeterminate for underlying organic cause (3) No findings accounting for weight loss and only incidental findings and (4) Normal study. Scan findings were correlated with the final diagnosis after all investigations. Univariate logistic regression was performed to determine associations between patient's baseline variables and positive CT scan findings. RESULTS: Of 301 eligible patients during the study period, 101 patients were excluded due to known history of malignancy, inadequate follow-up or inadequate scan technique. 200 patients were included in the final analyses. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of CT for organic pathology were 72.0%, 90.7%, 87.0%, 78.9% and 82.0% respectively. Additional symptoms, abnormal physical examinations, anemia, and raised tumor markers were significantly correlated with positive CT findings. Overall, the diagnostic yield of whole body CT scan for patients with unexplained weight loss was 33.5%. CONCLUSIONS: Whole body CT imaging may be a useful investigation for the noninvasive workup of patients with unexplained weight loss, with diagnostic yield of 33.5% and good sensitivity, specificity, positive and negative predictive values for organic etiologies.