The role of ultrasound scan in the diagnosis of occult inguinal hernias.

The aim of this study is to examine the role of ultrasound in conjunction with clinical judgment in diagnosing occult inguinal hernias in patients with groin pain.The study involved a retrospective analysis of 297 patients who presented over an 18 month period from January 2007 to August 2008. All the patients presented to outpatient clinic with groin pain but a normal or equivocal clinical examination. Data was obtained from hospital records, radiology system and operation notes.167 examinations (56%) were positive for a hernia, as a result of which 116 patients underwent surgery. At surgery, a hernia was found in 85 cases and no hernia was found in 31 cases. 130 examinations (44%) were negative for hernia. Six patients proceeded to surgery despite a negative ultrasound due to ongoing pain and a hernia was found in 5 cases. Overall, correlation with surgical findings showed ultrasound to have a sensitivity of 94%. Ultrasound used with clinical judgment has a positive predictive value of 73%.Ultrasound scan alone in diagnosing groin hernias is not effective when correlated with operative findings. However in conjunction with clinical judgment it is a useful tool in diagnosing occult inguinal groin hernias and aiding in further management.