Incidental Detection of a Type B3 Thymoma on 68Ga-FAPI-04 PET/CT Imaging

ABSTRACT

18F-FDG PET/CT performed for staging of colon cancer in a 60-year-old woman revealed a thymic neoplasm with increased radiopharmaceutical uptake in the anterior mediastinum. 68Ga-FAPI PET/CT showed low FAPI uptake in the anterior mediastinal mass. The patient was diagnosed with type B3 thymoma by histopathologic evaluation. In this case, thymoma demonstrated lower uptake with FAPI than FDG. Larger studies are required for the differentiation of malignant and benign mediastinal masses with FAPI.

18F-FDG PET/CT and 68Ga-FAPI-04 PET/CT Findings of Abdominal Leiomyosarcoma

ABSTRACT

A 56-year-old woman presented with abdominal pain and vomiting. Her abdominal CT revealed an retroperitoneal mass in the left upper quadrant of the abdomen. 18F-FDG PET/CT performed for metabolic characterization showed low to moderate heterogenous FDG uptake. 68Ga-fibroblast activation protein-specific inhibitor (FAPI)-04 PET/CT performed according to a research carried out in our department showed high heterogenous radiopharmaceutical uptake. The patient was diagnosed with leiomyosarcoma after R0 tumor resection. This case showed that 68Ga-FAPI-04 PET/CT could be a promising radiopharmaceutical in the evaluation of leiomyosarcomas.

Parasitic Appendicitis in 14.797 Cases: A Retrospective Cohort Study

Objective

This study aimed to determine the frequency of Enterobius vermicularis in appendectomy specimens and evaluate the histopathological characteristics of adult and pediatric cases with E. vermicularis infection.

Methods

Appendectomies examined from 1 January 2010, to 1 December 2020, were analysed retrospectively. Cases were divided into two groups: under 18 years (children) and 18 and over (adults). Demographic and histopathological characteristics of patients were also examined.

Results

Out of 14.797 patients that underwent appendectomy, 6.130 were children and 8.667 were adults. E. vermicularis was detected in 268 patients, wherein 64.2% were children and 35.8% were adults. In the detection of E. vermicularis in appendectomy specimens, the frequency was higher in children compared to that in adults (2.85%, 1.1%, respectively) (p<0.001). Histopathologically, acute appendicitis was defined in 31.7% (n=85) of 268 cases, and E. vermicularis was found to cause a higher rate of acute appendicitis in adults (p<0.001).

Conclusion

The frequency of E. vermicularis in appendectomy specimens is higher in children. However, E. vermicularis causes acute appendicitis more frequently in adults.

Assessment of demographic, clinical and histopathological features of patients who underwent appendectomy due to a presumed diagnosis of acute appendicitis

BACKGROUND

To compare the clinical, biochemical, and histopathological features of patients who underwent appendectomy due to a presumed diagnosis of acute appendicitis (AAp).

METHODS

The demographic, biochemical and histopathological data of 8206 patients who underwent appendectomy for AAp between January 2006 and March 2014 were retrospectively analyzed in this study. Patients were compared regarding the following characteristics: disruption by season (autumn vs. winter vs. spring vs. summer), working days (weekdays vs. weekends), histopathological findings (AAp vs. normal appendix [NAp]) and histopathological subgroup (non-perforated AAp vs. perforated AAp vs. NAp).

RESULTS

Of the 8206 patients aged between 16 and 89 years, 4763 (58.0%) were male. Appendectomy distribution by season was as follows: autumn (n=1959; 23.9%), winter (n=2062; 25.1%), spring (n=2061; 25.1%) and summer (n=2124, 25.9%). NAp rates were higher in summer than those in other seasons. White blood cell (WBC) and neutrophil levels were significantly higher in autumn and winter compared with those in other seasons. In total, 6120 (74.6%) appendectomies occurred on weekdays and 2086 (25.4%) on weekends. WBC and neutrophil levels were significantly higher on weekends than those on weekdays. Appendectomy distribution by histopathological groups as follows: AAp (n=7414; 90.3%) and NAp (n=792; 9.7%). Appendectomy distribution by histopathological subgroups was as follows: non-perforated AAp (n=6966; 84.9%), perforated AAp (n=448; 5.5%), and NAp (n=792; 9.7%). WBC, neutrophil, and TBil levels in the non-perforated and perforated AAp groups were significantly higher than in the NAp group. While most of the patients with perforated AAp (62.1%) and non-perforated AAp (59.6%) were males, most of the patients with NAp (58.1%) were females.

CONCLUSION

This study suggests that a relationship exists between demographic features, histopathological findings of appendectomy specimens, seasons, days of the week, and working days in patients undergoing appendectomy.