Medical Student Research Forum Posters

Shoulder MRI occasionally shows a low signal prominence at the anteroinferior glenohumeral joint (GHJ) recess resembling thickened capsular tissue which has an uncertain clinical significance.

Objectives are to examine the frequency of this finding on MR and if it is visualized on arthroscopy, and to correlate with other common shoulderpathologies seen on MR.

Cholecystectomy is the gold standard treatment for patients with acute cholecystitis. Patients who are high risk for complications from cholecystectomy can be offered percutaneous cholecystostomy (PC) tube placement. PC can be done to bridge high-risk patients for subsequent, elective cholecystectomy. 129 patients were identified to have undergone PC at UC Davis. 122 patients had their initial tube placed by UC Davis. Manual chart review to evaluatecharacteristics of patient population who’vereceived a PC tube, including demographics,radiation exposure, complications, andtreatment course.

The study aim was to characterize patientswho received PC at a tertiary academichospital to evaluate the potential populationbenefitting from gallbladder thermoablation.

To evaluate the impact of a formal anesthetic protocol on the peri and post procedural outcomes of ALS patients undergoing PRG.

Prostate cancer affects up to 11% of men over their lifetime. PSA screening has poor specificity and sensitivity. Standard technique for prostate bx: transrectal ultrasonography and either a transrectal or transperineal needle approach + 12-core sampling. Prostate MRI can visualize aggressive prostate cancer, help decide the need for prostate biopsy. MRI can also assist performing a more efficient targeted biopsy.

Aneurysmal subarachnoid hemorrhage (aSAH) results in significant mortality and disability. Delayed Cerebral Ischemia (DCI) is the leading cause of poor outcome after aSAH among those who survive the initial hemorrhage event. Significant effort is expended to identify patients at risk of DCI, but existing tests, such as trans-cranial Doppler, suffer from relatively poor sensitivity. Tests to identify patients with DCI prospectively are of high interest.

Small echogenic renal masses detected on ultrasound are most commonly angiomyolipoma (AMLs), however up to 5.1% of echogenic renal masses detected on ultrasound are renal cell carcinoma (RCC). While AMLs are the most common benign renal tumors, with prevalence between 0.2-0.6%. Most of these benign neoplasms are found incidentally on imaging and despite having smooth muscle, blood vessels, and adipose tissue, this is a heterogenous pathology. When AML contains little fat, they are isoechoic or only slightly hyperechoic on U/S and they can be mistaken for RCC.

To determine if CT features of adrenal nodules and of the remainder of the abdomen can predict autonomous cortisol secretion (ACH) in patients with adrenal nodules, and to identify a nodule size threshold below which ACH is unlikely. Retrospective review of adult patients with adrenal nodules who underwent CT of abdomen and 1-mg Dexamethasone suppression test within one year of each other. Patients were considered to have no ACH if serum cortisol was < 1.8 µg/dL after the 1-mg dexamethasone suppression test and to have possible or definite autonomous cortisol secretion if serum cortisol was > 1.8 µg/dL. The following CT features were assessed: Adrenal nodule length, nodule width, unenhanced nodule attenuation, contralateral adrenal gland thickness, visceral and subcutaneous adipose tissue area, skeletal muscle area and density, and unenhanced liver attenuation. 29 patients had no autonomous cortisol secretion and 29 patients had possible or definite autonomous cortisol secretion. Nodule length and width were the only two variables that significantly differed between patients with nonfunctional nodules and those with possibly or definitely functional nodules. Using a threshold nodule length of 1.5 cm, the sensitivity and specificity for predicting possible or definite autonomous cortisol secretion was 93.1% and 37.9% respectively. Autonomous cortisol secretion in patients with adrenal nodules correlates with increasing nodule size. A nodule length threshold of 1.5 cm provides 93.1% sensitivity for predicting possible or definite ACH based on the 1-mg Dexamethasone suppression test.

Idiopathic intracranial hypertension (IIH)

• Elevated intracranial pressure (ICP) with no clear cause

• Results in stenosed venous transverse sinus (TS)

•Stenosis causes pulsatile tinnitus

Treatment – Venous Sinus Stenting (VSS)

• Performed when the intravascular pressure (IVP) gradient across the stenosis is above 8 mmHg

• 10.3% revision surgery rate

• Most common reason for revision is the occurrence of a new stenosis upstream of the stent

• There is currently no standardized criteria for the selection of stents to be used in this procedure; they are used off-label