Role and Efficacy of 18F-FDG PET/CT in Following Up Desmoplastic Small Round Cell Tumor of the Abdomen: A Case Report.

Desmoplastic small round cell tumor (DSRCT) is an exceptionally rare and highly aggressive primary peritoneal neoplasm predominantly seen in adolescents and young adults. Despite the availability of various treatment modalities, the prognosis remains grim due to the tumor's aggressive nature and tendency for widespread metastasis. Although imaging of DSRCT is frequently documented using computed tomography (CT), the role of 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) in the initial diagnosis, staging, and particularly in the follow-up evaluation, is less explored.

Lymphoma Masquerading as Lung Cancer.

Lymphoma typically manifests as lymphadenopathy, with or without solid organ involvement. Lymphomatous masses tend to respect anatomical structures, encasing rather than invading them. Tumor thrombus formation is a rare presentation in lymphoma that has been previously described in the liver and kidneys.

Comparison of the performances of machine learning and deep learning in improving the quality of low dose lung cancer PET images.

Purpose: To compare the performances of machine learning (ML) and deep learning (DL) in improving the quality of low dose (LD) lung cancer PET images and the minimum counts required.

Materials And Methods: 33 standard dose (SD) PET images, were used to simulate LD PET images at seven-count levels of 0.25, 0.

Utility and pitfalls of the electrocardiogram in the evaluation of cardiac amyloidosis.

Background: Cardiac amyloidosis is a protein misfolding disorder involving deposition of amyloid fibril proteins in the heart. The associated fibrosis of the conduction tissue results in conduction abnormalities and arrhythmias. "Classical" electrocardiogram (ECG) findings in cardiac amyloidosis include that of low voltage complexes with increased left ventricular wall thickness on echocardiography.

"Hot Cord" Sign on 18F-FDG PET/CT in a Patient With Acute Myelitis Due to Neuromyelitis Optica Spectrum Disorder.

A 44-year-old woman presented with prolonged low-grade fever, bilateral upper limb weakness, and hyperesthesia. MRI showed hyperintense T2 signal and enhancement of the cervicothoracic spinal cord. F-FDG PET/CT was requested to investigate pyrexia of unknown origin.

Lymphoma Recurrence Along the Lymphatic Tract on 18F-FDG PET/CT Presenting as Lower Limb Swelling.

A 66-year-old woman with a known history of diffuse large B-cell lymphoma presented with left lower limb swelling following recent long-distance air travel. Ultrasound Doppler showed no evidence of deep vein thrombosis. In view of her medical history, an F-FDG PET/CT was ordered that found a soft tissue mass following the course of the femoral neurovascular bundle along the anteromedial aspect of the left thigh down to the popliteal fossa and the lateral calf muscle.

18F-FDG PET/CT Scan Can Predate Clinical Presentation in Acute Appendicitis.

Acute appendicitis is a clinical diagnosis typically presenting with right lower quadrant pain. We describe the case of an asymptomatic 53-year-old man with stage 2A diffuse large B-cell lymphoma, who underwent F-FDG PET/CT at the completion of chemotherapy. The scan showed complete lymphomatous disease remission.

Maxillary mesenchymal chondrosarcoma presenting with epistaxis in a child.

Mesenchymal chondrosarcomas are a rare variant of primary chondrosarcomas and can pose a diagnostic dilemma, especially when the features on conventional imaging are equivocal for an aggressive lesion. There is very little PET-CT experience in mesenchymal chondrosarcomas as per the literature and to the best of our knowledge, we are the first to describe a maxillary mesenchymal chondrosarcoma on PET-CT imaging. We report a case where PET-CT not only complemented conventional imaging in suspecting a malignant osseous lesion, but also was indicative of the grade of the tumor.

(68)Ga-DOTA-peptide: A novel molecular biomarker for nasopharyngeal carcinoma.

Background: Increased somatostatin receptor (SSTR) expression in patients with undifferentiated nasopharyngeal carcinoma (NPC) has been demonstrated with receptor autoradiography, (111) In-Octreotide scintigraphy, and (68) Ga-DOTA-TOC positron emission tomography (PET)/CT imaging. We sought to compare and correlate the uptake of fluorodeoxyglucose (FDG) and DOTA-NOC in undifferentiated NPC to ascertain the possible role of (68) Ga-DOTA-NOC PET/CT as a new imaging biomarker and to assess whether targeted peptide receptor radionuclide therapy is a feasible treatment option.

Methods: After obtaining approval from our institutional review board, 4 patients with biopsy proven nonkeratinizing undifferentiated NPC who had just undergone routine staging/restaging (18) F-FDG PET/CT imaging were prospectively and consecutively recruited for (68) Ga-DOTA-NOC PET/CT imaging.

Impact of Image Reconstruction Settings on Texture Features in 18F-FDG PET.

Unlabelled: Evaluation of tumor heterogeneity based on texture parameters has recently attracted much interest in the PET imaging community. However, the impact of reconstruction settings on texture parameters is unclear, especially relating to time-of-flight and point-spread function modeling. Their effects on 55 texture features (TFs) and 6 features based on first-order statistics (FOS) were investigated.

Incidental possible diagnosis by 18F-fluorocholine PET/CT of Meckel's diverticulum and potential pitfalls.

Unlabelled: A 61 years old man with a history of prostate cancer Gleason 3+4, treated with radical prostatectomy, underwent fluorine-18-fluorocholine positron emission tomography/computed tomography ((18)F-FCH PET/CT) imaging to investigate rising serum prostate specific antigen (PSA) levels. (18)F-FCH PET/CT showed a focus of linear increased uptake by a possible Meckel's diverticulum in the right hemi-pelvis, which was an incidental finding in this asymptomatic patient. Uptake of (18)F-FCH by Meckel's diverticulum has not been reported before and thus the mechanism of uptake has not been established.

Asymptomatic metastasis to cricoid from prostate carcinoma: an incidental finding detected on 18F-choline PET/CT.

Metastases to the larynx from prostate carcinoma are rare. We describe a case of asymptomatic prostate carcinoma metastasis to the right cricoid cartilage detected on 18F-fluorocholine PET/CT. This was histologically proven on open biopsy and the patient was offered local radiotherapy.

Nephrogenic systemic fibrosis in a patient with renal failure demonstrating a "reverse superscan" on bone scintigraphy.

Nephrogenic systemic fibrosis (NSF) has been linked to utilization of gadolinium-based contrast agents in patients with renal impairment. We present a 19-year-old female patient with end-stage renal failure presenting with joint pains and subcutaneous nodules. She had a prior gadolinium-enhanced magnetic resonance angiography when she was 14 years old.