Sex differences in 123I-mIBG scintigraphy imaging techniques in patients with heart failure

BACKGROUND

123I-mIBG-scintigraphy could be a useful stratifying tool for patients with heart failure (HF). The purpose of this retrospective study is to evaluate whether there are differences between men and women with HF in terms of the prediction of cardiac arrhythmic events (AE).

RESEARCH AND METHODS

A total of 306 patients, before implantable-cardioverter-defibrillator (ICD) implantation, were evaluated. They underwent 123I-mIBG-scintigraphy and an evaluation of the results was performed after 85 months of follow-up. Early and late planar and SPECT cardiac images were acquired. Heart-to-mediastinum ratio (HM) for planar images and the sum of the segmental scores (SS) for SPECT were calculated.

RESULTS

In the general population, age, early SS (ESS), late SS (LSS), and ejection fraction (EF) were statistically significant for the prediction of AE at Cox regression, while early and late HM (eHM,lHM) were not significative for the prediction of AE. Population was divided into females and males and univariate analysis was conducted separately for the two cohorts: no significant variables for prediction of AE were found in females. For males, ESS, LSS, EF, and late HM were statistically significant predictors of AE. The overall survival was similar in males and females, but the risk of AE is lower in males than in females.

CONCLUSIONS

123I-mIBG represents a more effective tool for the prediction of AE in male patients than in women.

A Systematic Review on Dementia and Translocator Protein (TSPO): When Nuclear Medicine Highlights an Underlying Expression

Background: Translocator protein (TSPO) is a neuroinflammation hallmark. Different TSPO affinity compounds have been produced and over time, the techniques of radiolabeling have been refined. The aim of this systematic review is to summarize the development of new radiotracers for dementia and neuroinflammation imaging. Methods: An online search of the literature was conducted in the PubMed, Scopus, Medline, Cochrane Library, and Web of Science databases, selecting published studies from January 2004 to December 2022. The accepted studies considered the synthesis of TSPO tracers for nuclear medicine imaging in dementia and neuroinflammation. Results: A total of 50 articles was identified. Twelve papers were selected from the included studies’ bibliographies and 34 were excluded. Thus, 28 articles were ultimately selected for quality assessment. Conclusion: Huge efforts in developing specific and stable tracers for PET/SPECT imaging have been made. The long half-life of 18F makes this isotope a preferable choice to 11C. An emerging limitation to this however is that neuroinflammation involves all of the brain which inhibits the possibility of detecting a slight inflammation status change in patients. A partial solution to this is using the cerebellum as a reference region and developing higher TSPO affinity tracers. Moreover, it is necessary to consider the presence of distomers and racemic compounds interfering with pharmacological tracers’ effects and increasing the noise ratio in images.

Preoperative Multiparametric Ultrasound and Fine Needle Aspiration Cytology evaluation of parotid gland tumors: which is the best technique?

AIMS

To evaluate the pre-surgical diagnostic value of Multiparametric Ultrasound (MPUS) and Fine Needle Aspiration Cytology (FNAC) in differentiating parotid gland tumors, comparing the results with histology.

MATERIALS AND METHODS

The study enrolled 84 patients with parotid gland lesions surgically treated in a single tertiary center and evaluated by MPUS. Each patient underwent FNAC. Histological examination was considered the gold standard.

RESULTS

Histology identified 62 benign tumors and 22 malignancies. In the differential diagnosis between malignant and benign lesions, B-mode Ultrasound (US), Color-Doppler US, Contrast-Enhanced US (CEUS), Elastography (USE) and FNAC showed the following values of sensitivity: 82%, 81%, 86%, 77%, 73% respectively; specificity: 97%, 61%, 95%, 71%, 97% respectively; PPV: 90%, 43%, 86%, 50%, 89% respectively; NPV: 93%, 90%, 95%, 88%, 91% respectively; and accuracy: 89%, 71%, 90%, 78%, 84% re-spectively.

CONCLUSIONS

CEUS proved to be a valid and accurate method for identifying malignant tumors of parotid gland; the combination of B-mode US with CEUS showed similar diagnostic accuracy, but better sensitivity than CEUS taken alone. USE did not improve the diagnostic performance of the B-mode US, alone or in association with CEUS; however, it revealed the highest diagnostic accuracy in the differentiation between benign lesions. FNAC demonstrated lower values in comparison with CEUS and with USE. Therefore, according to our study, MPUS could be proposed as a valid alternative to FNAC.

Targeted Alpha Therapy with Thorium-227

Targeted alpha therapy (TAT) can deliver high localized burden of radiation selectively to cancer cells as well as the tumor microenvironment, while minimizing toxicity to normal surrounding cell. Radium-223 (²²³Ra), the first-in-class α-emitter approved for bone metastatic castration-resistant prostate cancer has shown the ability to prolong patient survival. Targeted Thorium-227 (²²⁷Th) conjugates represent a new class of therapeutic radiopharmaceuticals for TAT. They are comprised of the α-emitter ²²⁷Th complexed to a chelator conjugated to a tumor-targeting monoclonal antibody. In this review, the authors will focus out interest on this therapeutic agent. In recent studies ²²⁷Th-labeled radioimmunoconjugates showed a relevant stability both in serum and vivo conditions with a significant antigen-dependent inhibition of cell growth. Unlike ²²³Ra, the parent radionuclide ²²⁷Th can form highly stable chelator complexes and is therefore amenable to targeted radioimmunotherapy. The authors discuss the future potential role of ²²⁷Th TAT in the treatment of several solid as well as hematologic malignancies.

Extraocular muscle sampled volume in Graves' orbitopathy using 3-T fast spin-echo MRI with iterative decomposition of water and fat sequences

Background

Current magnetic resonance imaging (MRI) techniques for measuring extraocular muscle (EOM) volume enlargement are not ideally suited for routine follow-up of Graves’ ophthalmopathy (GO) because the difficulty of segmenting the muscles at the tendon insertion complicates and lengthens the study protocol.

Purpose

To measure the EOM sampled volume (SV) and assess its correlation with proptosis.

Material and Methods

A total of 37 patients with newly diagnosed GO underwent 3-T MRI scanning with iterative decomposition of water and fat (IDEAL) sequences with and without contrast enhancement. In each patient, the three largest contiguous coronal cross-sectional areas (CSA) on the EOM slices were segmented using a polygon selection tool and then summed to compute the EOM-SV. Proptosis was evaluated with the Hertel index (HI). The relationships between the HI value and EOM-SV and between HI and EOM-CSA were compared and assessed with Pearson’s correlation coefficient and the univariate regression coefficient. Inter-observer and intra-observer variability were calculated.

Results

HI showed a stronger correlation with EOM-SV (P < 0.001; r = 0.712, r²= 0.507) than with EOM-CSA (P < 0.001; r = 0.645 and r²= 0.329). The intraclass correlation coefficient indicated that the inter-observer agreement was high (0.998). The standard deviation between repeated measurements was 1.9–5.3%.

Conclusion

IDEAL sequences allow for the measurement EOM-SV both on non-contrast and contrast-enhanced scans. EOM-SV predicts proptosis more accurately than does EOM-CSA. The measurement of EOM-SV is practical and reproducible. EOM-SV changes of 3.5–8.3% can be assumed to reflect true volume changes.

MRI rare finding: Absence of the left liver lobe

We report a rare case of left liver lobe absence in an 80-year-old male patient discovered during an MRI scan. The main imaging features of this condition are briefly reviewed, together with its pathogenesis and the most common associations and differential diagnoses.

Prospective evaluation of Quasistatic Ultrasound Elastography (USE) compared with Baseline US for parotid gland lesions: preliminary results of elasticity contrast index (ECI) evaluation

AIMS

To assess the diagnostic value of elasticity contrast index (ECI) elastography, in comparison with conventional ultrasound for the differentiation of benign and malignant parotid lesions.

MATERIAL AND METHODS

Sixty-three consecutive patients with parotid gland tumors, treated surgically at a single tertiary center were enrolled. Ultrasound evaluation consisted of B-mode, color-Doppler and quasistatic ultrasound elastography (USE), conducted with the ECI technique. For each lesion the echogenicity, margins, vascularization, and capsulation were considered to determine benign or malignant lesions. Histology was considered the gold standard.

RESULTS

Using conventional parameters, the observer suggested malignant lesions in 20 cases and benign lesions in 43 cases (accuracy: 61.8%). ECI>3.5 alone was the most accurate parameter (accuracy: 90.5%), with sensitivity of 93.7% and specificity of 89.4%. However, when combined with the other US criteria, no statistically significant diagnostic accuracy improvement was achieved.

CONCLUSIONS

Our results show that USE with ECI index measurement can help to discriminate preoperatively benign from malignant lesions, with the exception of pleomorphic adenoma which is stiff. We suggest that USE can be used as an additional tool to conventional US evaluation of salivary gland lesions.

Endorectal ultrasonography performance in staging rectal cancer before and after neoadjuvant chemoradiotherapy

AIM

To evaluate accuracy of endorectal ultrasonography (ERUS) both in staging and restaging rectal cancer after neoadjuvant chemoradiotherapy treatment.

METHODS

In a group of 80 patients with rectal cancer, we retrospectively selected 67 patients and divided in two groups: 41 patients affected by a stage I were investigated with a single preoperative endorectal sonography; 26 patients with locally advanced rectal cancer (stage II or more) were restaged after neoadjuvant treatment, which consisted of 5,040 cGy in 28 daily fractions associated with continuous infusion of 5-Fluorouracil. All patients underwent surgery and ERUS findings were subsequently compared with histological findings.

RESULTS

Diagnostic accuracy of ERUS in the first group of patients was high: in fact T-staging was accurate in 85% of cases. Results in the second group were significantly less accurate, with a correct T-staging just for 47% of cases. Nodes involvement was correctly evaluated in 86% of cases for the first group and in 63% of cases for the second one.

CONCLUSIONS

Endorectal sonography is a valid staging modality for early rectal malignancy. Advanced cancer is treated with neoadjuvant preoperative chemoradiotherapy which is associated with better outcome than postoperative treatment. We found endorectal sonography, based on the layer model of rectal wall, often fails restaging and we think we have to develop new criteria for a correct preoperative assessment after neoadjuvant chemoradiation.

KEY WORDS

Endorectal ultrasonography, Neoadjuvant chemoradiotherapy, Rectal cancer, Staging.

A case of symptomatic mass in the right iliac fossa: a Bermuda Triangle which often lies the right diagnosis

Disease of the iliac fossa can often be accompanied by non-specific symptoms and some of these are exclusively caused by the compression of bulky masses of other neighboring structures. In young women a differential diagnosis is a non trivial task as several possible causes have to be taken into account. Thus, intraligamentary tumors, which are extremely rare finding, are frequently confused with uterus, ovary or intestinal tumors. Even if myomas are the most benign tumors of the female genital tract, broad ligament leiomyomas are an unusual finding in women of reproductive age. These tumors are often asymptomatic until they reach a volume likely to cause symptoms related to the mass pressure. An accurate patient's anamnesis and examination serve as a guide to further examinations. Ultrasound is the first line imaging as it can show ovarian or other pelvic mass and doesn't involve exposure to radiations in young patients, who can be pregnant. We describe the clinical presentation and imaging features of a broad ligament leiomyoma, which presented as an inguinal mass in a patient with a right iliac fossa pain. We also report our diagnostic process performing the differential diagnosis with other potential pathologies of RIF. In these cases, a preoperative disease classification discriminating the benign or malignant tumor nature is closely linked to the proper patient management.

A case of duodenal duplication in an adult

We report a rare case of duodenal duplication, manifested in an adult with aspecific symptoms, whose diagnosis was possible with ultrasound at the beginning and then with gastrointestinal barium study, endoscopic ultrasonography and contrast enhanced CT scan; it was confirmed surgically.

Preoperative evaluation of primary hyperparathyroidism: role of diagnostic imaging

This study analyses the diagnostic value of preoperative diagnostic imaging examinations in the identification and location of pathological parathyroid glands. We examined 77 patients with primary hyperparathyroidism using ultrasonography of the neck and Tc99m-MIBI scintigraphy for preoperative assessment purposes. All patients underwent surgical treatment. We compared the diagnostic imaging results with those furnished by histological examinations. TC99m-MIBI scintigraphy revealed the presence of a pathological parathyroid gland in 74/77 cases (96.1%) compared with 75/77 cases (97.4%) diagnosed by ultrasonography. The two examinations combined detected pathological glands in 100% of cases. The location of the pathological gland was correct in 57 cases (74.0%) at scintigraphy and in 56 cases (72.7%) at ultrasonography. In one case (1.3%) persistent hyperparathyroidism was demonstrated. There were no cases of relapse. In this study preoperative evaluation by ultrasonography and scintigraphy displayed great sensitivity in identifying and locating pathological parathyroid glands. Surgical neck exploration is still the gold standard in the correct location of pathological parathyroid glands measuring less than 5 mm.