Incidental Tc-99m MIBI Lung Uptake in Parathyroid Scintigraphy.

Diffuse Tc-99m MIBI uptake in the lungs during parathyroid scintigraphy is exceptional, and only a few cases have described this unusual aspect. The differential diagnostic of this funding is a challenge when interpreting the examination, since it can be a sign of serious pathology. We report the case of unexpected diffusely increased Tc-99m MIBI uptake in bilateral lung fields in a patient with left cardiac dysfunction.

Snow Leopard Appearance of Subcutaneous Panniculitis such as T-cell Lymphoma on 18F-FDG PET/CT.

Subcutaneous panniculitis such as T-cell lymphoma (SPTCL) is a very rare disorder. Patients usually present with multiple subcutaneous nodules on the extremities without visceral disease. Dissemination to extra-cutaneous sites is unusual. Only a few cases of SPTCL have been reported in the literature describing the findings of 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET). Here, we represent an interesting and unusual case of diffuse SPTCL with snow Leopard skin appearance on 18F-FDG PET/computed tomography.

Neurolymphomatosis diagnosed on [18F]FDG PET/CT.

Fluorine-18-deoxyglucose positron emission tomography/computed tomography ([18F]FDG PET/CT) has been shown to be superior to other conventional imaging modalities in the detection of extra-nodal lymphomatous localizations. Especially in neurolymphomatosis which is rarely encountered in high-grade lymphomas. We report a case of a woman diagnosed with non-Hodgkin lymphoma, whose initial staging with [18F]FDG PET/CT showed increased [18F]FDG uptake along the brachial and sacral plexuses. [18F]FDG PET/CT remains the most appropriate diagnostic tool in these cases, whose prognosis is often poor.

COVID-19 Pneumonia was Incidentally Detected on 18F-Fluorocholine PET/CT in a Work-up for Prostate Cancer.

This is a presentation of the case of a patient who underwent 18F-fluorocholine positron emission/computed tomography to stage a prostate cancer with incidentally found bilateral pneumonia. A high prevalence of incidental pneumonia is very probable under the current circumstance of coronavirus disease-2019 (COVID-19) pandemic, and oncological patients are at increased risk of COVID-19 with poorer outcome. The lung inflammatory burden in the case of COVID-19 infection can be demonstrated by 18F-fluorocholine.

Unusual finding of bronchopulmonary carcinoma through a pterygoid muscle metastasis. About a case.

Bronchopulmonary cancer muscle metastases are uncommon, especially when they are visible. They can impact any muscle in the body, but the psoas, diaphragmatic, and paravertebral muscles have a clear advantage. We present a case of lateral pterygoid muscle metastasis of squamous cell carcinoma of the lung in a 70-year-old habitual smoker (40 packs per year) presents headaches more marked on the right and progressively worsening. A complementary brain MRI revealed a well-limited oval formation with irregular contours in hypo signal T1 hyper signal T2 heterogeneous, with area of central necrosis of the right pterygoid muscle, which was revealed to be a secondary location of bronchopulmonary malignancy after further examination (CT scan of the cervico-thoraco-abdomino-pelvic region, TEP scan, and biopsy). Moreover, muscle metastases are rarely revealing of primary cancer.

Bilateral renal involvement in diffuse large B-cell lymphoma on fluorodeoxyglucose positron emission tomography/computed tomography.

Secondary renal involvement in patients with diffuse large B-cell lymphoma (DLBCL) is rare and associated with poor prognosis. We, hereby, described a case of a patient diagnosed with DLBCL, in whom bilateral renal involvement was detected on 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT). The patient received 4 courses of chemotherapy, and follow-up 18F-FDG PET/ CT revealed the complete resolution of the diffuse increased renal 18F-FDG uptake. Renal lymphoma is uncommon and 18F-FDG PET/CT is particularly useful for detecting extranodal involvement in DLBLC.

A rare case of pituitary metastasis from breast cancer detected on fluorodeoxyglucose positron emission tomography/computed tomography that presented as insipid diabetes.

Pituitary metastases are rare, are generally asymptomatic, and often remain undiagnosed. Breast cancer is the most common primary cancer metastasizing to hypophysis in women. However, it is difficult to clinically and radiologically differentiate pituitary metastases from pituitary adenomas. We report a case of pituitary metastases diagnosed on magnetic resonance imaging and positron emission tomography/computed tomography, which was the prime manifestation of a breast cancer in a 46-year-old female. This cancer was revealed by insipid diabetes.

Contribution of radiobiphosphonates bone scan in multifocal tuberculous osteomyelitis.

We share the case of a 86-year-old male patient, followed up for recent left hip pain. Interrogation revealed a fever, nocturnal shivering, and bone pains. Standard radiographs and computed tomography centered on both shoulders and pelvis showed osteoarthritis of the left hip and multiple lytic lesions in both humeral heads and clavicles, suggestive of chronic infectious, metabolic, or secondary disease. Bone scan with radiobiphosphonates showed intense and diffuse uptake in the clavicles, the two humeral heads, and at the cervical and dorsal spine. Biopsy of the left humeral head confirmed the diagnosis of tuberculous osteomyelitis, showing an aspect of caseo-follicular tuberculosis. Bone scan with radiobiphosphonates can be used in our context to search other localizations falling within the framework of a polystotic form, and also to guide nonrisk biopsy in such group of patients.

Peritoneal Super Scan on 18F-FDG PET/CT in two patients with Lymphoma.

  Peritoneal lymphomatosis is an extremely rare presentation of lymphoma. Due to its relative low frequency, it receives much less attention than peritoneal carcinomatosis. The challenge is to differentiate between lymphomatosis and carcinomatosis, as well as peritoneal tuberculosis or other pathologic entities within the peritoneal cavity based essentially on radiologic features. 18F-FDG PET/CT is the main imaging modality for staging and monitoring response to treatment in lymphoma. Peritoneal lymphomatosis is most often associated to aggressive histological subtypes of high-grade lymphoma which are reputed high FDG uptake. We report two cases of Burkitt's lymphoma and diffuse large B cell lymphoma (DLBCL), with intense FDG uptake involving the entire peritoneum and decreased FDG activity of the rest of the body including brain and kidneys, giving it an appearance of "peritoneal super scan", follow up FDG PET/CT showed the disappearance of the peritoneal lymphomatosis and the reappearance of cerebral and urinary activity synonym of complete metabolic response.

Multiple scalp metastases from pulmonary adenocarcinoma seen on fluorodeoxyglucose positron-emission tomography/computed tomography.

Scalp metastasis from a primary visceral malignancy is an uncommon clinical entity. Here, we report a case of scalp metastases from lung cancer seen on fluorodeoxyglucose positron-emission tomography-computed tomography.

Unsuspected Intramedullary Spinal Cord Metastasis Detected by FDG PET/CT.

Intramedullary spinal cord metastases (SCMs) are extremely rare. Here, we report a case of a 60-year-old man with a history of right nonsmall cell lung cancer treated by concomitant radiochemotherapy who complained, 9 months after treatment completion, of chest pain, breath shortness, and more recently back pain. An 18F-FDG PET/CT was performed as part of the restaging process and showed a hypermetabolic mass of the right lung in addition to ipsilateral mediastinal hypermetabolic lymph nodes. There was also an FDG avid lesion of thoracic spinal cord at the T11-T12 level consistent with SCM as confirmed by MRI.

A case of Tietze's syndrome visualized on PET/CT-FDG.

We report an interesting image of a 49-year-old woman revealed with Tietze's syndrome (TS) by ¹8F-FDG PET/CT. She presented with right upper sternum pain with a hard and fixed palpable mass. Chest radiograph and CT-Scanner revealed no abnormalities. PET/CT-FDG showed a hypermetabolic activity around right sternoclavicular joint, which was the correct symptomatic lesion. Hence, FDG PET/CT may be useful for diagnosing TS and to accurately detect the symptomatic lesion.

Unusual pathological fracture of the clavicle revealing primary hyperparathyroidism: a case report.

BACKGROUND: Primary hyperparathyroidism revealed by a pathological fracture is very uncommon; in the majority of cases the discovery of lytic bone lesions on imaging examinations evokes in the clinician first a neoplastic etiology and a metabolic origin is often omitted. This case report adds to the existing literature as it describes an unusual presentation of primary hyperparathyroidism. CASE PRESENTATION: We report a case of a 50-year-old Moroccan man, without any known tumor, who presented a fracture of his left clavicle with multiple osteolytic lesions on computed tomography suggesting bone metastases. However, bone scintigraphy oriented the diagnosis to a metabolic pathology by showing a metabolic bone "super scan" with increased tracer uptake in the left clavicle; parathyroid scintigraphy was able to localize pathological right parathyroid tissue. CONCLUSIONS: Whenever multiple osteolytic lesions are found in a patient without any known tumor, metabolic bone diseases including hyperparathyroidism should be highly considered.