The Correlation Between 18F-Fluorodeoxyglucose-Positron Emission Tomography/Computed Tomography Semiquantitative Parameters and the Clinical Features and Pathological Biological Indexes of Gastric Cancer.

Objective: This study explored the application value of the maximum standard uptake value (SUVmax) of 18F-fluorodeoxyglucose-positron emission tomography/computed tomography (18F-FDG PET/CT) in gastric cancer. Materials and Methods: Data of 164 patients with gastric cancer who had undergone18F-FDG PET/CT before a biopsy were collected, and the correlation of SUVmax with clinical stage, pathological differentiation degree, human epidermal growth factor receptor-2 (HER-2) status, and Ki-67 index of gastric cancer was analyzed. Results: The SUVmax of poorly differentiated adenocarcinoma was significantly higher than that of moderately differentiated adenocarcinoma and signet-ring cell carcinoma (p < 0.01), and SUVmax in the well-differentiated adenocarcinoma group was higher than that in the signet-ring cell carcinoma group (p < 0.01). The SUVmax in the HER-2 negative group was higher than that in the HER-2 positive group (p < 0.01). The SUVmax was higher in the Ki-67 high expression group than in the low expression group (p < 0.01), and there was a significant positive correlation between the two (p < 0.01). Conclusion: 18F-FDG PET/CT SUVmax can, to some extent, predict the degree of differentiation, HER-2 status, and Ki-67 index of gastric cancer patients.

Preoperative diagnosis of the sclerosed hemangioma of the liver using multimodality imaging findings: A case report.

A sclerosed hemangioma of the liver is a rare benign lesion characterized by fibrosis and hyalinization of a hepatic cavernous hemangioma as a result of degeneration. This condition has been difficult to correctly diagnose with imaging. Our patient was a 57-year-old man whose computed tomography (CT) scan showed a mass of 45 mm in diameter in the lateral segment. On dynamic contrast-enhanced CT, the lesion was found to comprise peripheral, gradual, and heterogeneous enhanced areas with a central nonenhanced area; malignancy was suspected. On magnetic resonance imaging, the peripheral area showed slight hperintensity on T2-weighted image, and showed a similar intensity on T1- and diffusion-weighted images as compared to the background liver and gradual enhancement, and the presence of abundant fibrous tissue was suspected. Conversely, the central area showed remarkable hyperintensity on T2-weighted images and no enhancement, and degeneration or hyalinization was suspected. The mass showed no uptake of fluorine-18 fludeoxyglucose (FDG). Some imaging findings suspected a benign tumor, and sclerosed hemangioma with abundant fibrosis and hyalinization was pathologically confirmed. Herein, we report a case of sclerosed hemangioma focusing on possible preoperative diagnosis using a combination of multimodality imaging findings-diffusion-weighted imaging and FDG-positron emission tomography imaging.

Clinical Pearls: Etiologies of Superscan Appearance on Fluorine-18-Fludeoxyglucose Positron Emission Tomography-Computed Tomography.

The term "superscan" usually refers to a characteristic pattern on skeletal scintigraphy consisting of symmetrically intense and diffuse radiotracer uptake in the skeleton with absent or diminished visualization of the genitourinary system and soft tissues. Superscans and superscan-like appearances have also been described on fluorine-18-fludeoxyglucose positron emission tomography-computed tomography (18-F-FDG PET/CT). We review reported cases of 18-F-FDG PET/CT superscans and propose criteria for differentiating pathologic superscans from physiologic causes. Knowledge of the 18-F-FDG PET/CT superscan, its reported pathologic causes, its benign imitators, and its clinical implications is important to the nuclear medicine physician or radiologist specializing in the interpretation of nuclear studies to avoid several diagnostic pitfalls.

Correlation of18F-FDG PET/CT SUVmax value with clinical parameters and biological indicators in patients with lymphoma / 肿瘤

Objective: To evaluate the application value of fluorine-18-fludeoxyglucose (18F-FDG) PET/CT maximal standard uptake (SUVmax) in the diagnosis of lymphoma. Methods: A total of 103 patients with lymphoma which confirmed by pathological diagnosis in Gansu Provincial Hospital from January 2011 to December 2016 were collected. All patients underwent a whole body simultaneous18F-FDG PET/CT and had complete clinical data. The possible relationships of SUVmax with the different pathological subtypes, clinical stages and risk grades of lymphoma were analyzed. The correlations of SUVmax value with Ki-67 index, lactate dehydrogenase (LDH) and erythrocyte sedimentation rate (ESR) were analyzed. Results: There was no significant difference in SUVmax between Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL) (P > 0.05). The SUVmax in patients with strongly invasive diffuse large B-cell lymphoma (DLBCL), T-lymphoblastic lymphoma (T-LBL), anaplastic large cell lymphoma (ALCL) and natural killer (NK)/T cell lymphoma was higher than that in patients with relatively weakly invasive mantle cell lymphoma (MCL), peripheral T-cell lymphoma (PTCL), small lymphocytic lymphoma (SLL), follicular lymphoma (FL) (grade 1-2) and marginal zone lymphoma (MZL) (P 0.05). The SUVmax had no significant difference between stage -Ⅱ and III- in the patients with lymphoma (P > 0.05). The SUVmax in the patients with high-risk NHL was higher than that in the patients with intermediate- and low-risk NHL (both P 0.05). Conclusion:18F-FDG PET/CT SUVmax can be used as a reference indicator for evaluating the invasive degree of lymphoma, predicting Ki-67 index, and judging the risk classification of NHL.