FDG PET/CT findings of a glomangiopericytoma

PET/CT Imaging in Treatment Planning and Surveillance of Sinonasal Neoplasms

Sinonasal cancers are uncommon malignancies with a generally unfavorable prognosis, often presenting at an advanced stage. Their high rate of recurrence supports close imaging surveillance and the utilization of functional imaging techniques. Whole-body 18F-FDG PET/CT has very high sensitivity for the diagnosis of sinonasal malignancies and can also be used as a "metabolic biopsy" in the characterization of some of the more common subgroups of these tumors, though due to overlap in uptake, histological confirmation is still needed. For certain tumor types, radiotracers, such as 11C-choline, and radiolabeled somatostatin analogs, including 68Ga-DOTATATE/DOTATOC, have proven useful in treatment planning and surveillance. Although serial scans for posttreatment surveillance allow the detection of subclinical lesions, the optimal schedule and efficacy in terms of survival are yet to be determined. Pitfalls of 18F-FDG, such as post-surgical and post-radiotherapy crusting and inflammation, may cause false-positive hypermetabolism in the absence of relapse.

Glomangiopericytoma Uptake With 99mTc-MIBI, 18F-FDG, and 11C-Choline

ABSTRACT

The author presents 3 incidental cases of glomangiopericytoma exhibiting avidity of 99mTc-MIBI, 18F-FDG, and 11C-choline, respectively, during SPECT/CT evaluation of hyperparathyroidism, and PET/CT monitoring of metastatic melanoma and biochemical recurrence of prostate cancer. All the 3 cases show similar functional and anatomic features of tracer-avid lesion in the right nasal cavity from histologically proven glomangiopericytoma.

CT and MRI Findings of Glomangiopericytoma in the Head and Neck: Case Series Study and Systematic Review

Glomangiopericytoma is a rare sinonasal mesenchymal tumor of borderline or low malignant potential. We reviewed the CT and MR imaging findings of head and neck glomangiopericytoma via a retrospective case series study and systematic review. Our study revealed that glomangiopericytoma is a well-defined lobulated avidly enhancing soft-tissue mass with erosive bony remodeling that is most commonly found in the sinonasal cavity. Typically, it is hyperintense on T2-weighted images with vascular signal voids, has a high mean ADC value, and a wash-in and washout pattern on dynamic contrast-enhanced MR imaging. Although the CT findings are nonspecific, typical MR imaging findings, including those on the ADC map and dynamic contrast-enhanced MR imaging, may be helpful for differentiating glomangiopericytomas from other hypervascular tumors in the head and neck.

Glomangiopericytoma of the Spinal Cord

Glomangiopericytoma, also referred to as a hemangiopericytoma-like tumor or sinonasal type hemangiopericytoma, is a rare tumor of the nasal cavity and paranasal sinus that has never been reported in the spinal cord. Here, we report a case of a 47-year-old man who developed glomangiopericytoma in the thoracic spine. This lesion showed a heterogeneous high signal intensity compared to the spinal cord on a T2-weighted image and an easily enhanced isointense signal on a T1-weighted image.

Relationship between 18FDG-PET and different types of sinonasal malignancies

CONCLUSION

The sensitivity and specificity of a ¹⁸FDG-PET scan may be different according to the histology. The SUV_max and SUV ratio may reflect the tumor's aggressive behavior.

OBJECTIVES

To describe the characteristics of PET/CT scans, including the maximum standard uptake values (SUV_max), at initial diagnosis according to six main types of sinonasal malignancies: sinonasal adenocarcinoma (SNAC), sinonasal undifferentiated carcinoma (SNUC), adenoid cystic carcinoma (ACC), sinonasal malignant melanoma (SMM), olfactory neuroblastoma (ONB), and sinonasal neuroendocrine carcinoma (SNEC).

METHODS

A chart review of 50 patients who were diagnosed and treated for six sinonasal malignancy types over a period of 6 years was conducted. Any ¹⁸F-FDG PET/CT scans for each patient were searched using the hospital's intranet. The SUV_max of the primary sinonasal site was recorded. The liver SUVs were utilized as reference SUVs. The SUV ratio was defined as the ratio of the SUV_max of the primary tumor and the SUV_liver.

RESULTS

The most common malignancy was SNAC (32%), followed by SNUC (24%), ONB (14%), ACC (10%), SMM (10%), and SNEC (10%). The SUV_max and SUV ratio values were significantly different between tumor types (p = 0.002 and 0.012, respectively). SNUC had the highest mean SUV_max (14.2), followed by SNAC (9.9). A similar mean SUV_max was observed for SMM, ONB, and ACC (∼ 7.0). SNEC up-takes the least ¹⁸FDG among these six tumor types (mean SUV_max= 4.7).

Sinonasal glomangiopericytoma: Is anything new?

More than 100 cases of sinonasal hemangiopericytoma have been reported in the literature, but only a handful of cases of nasal glomangiopericytoma. In this article, we report a case of a nasal glomangiopericytoma that was treated with endonasal surgical excision. We also attempt to clarify the confusion that attends to the nomenclature surrounding the terms glomangiopericytoma and hemangiopericytoma, which are often used interchangeably. Although glomangiopericytomas are histologically similar to sinonasal hemangiopericytomas, they sometimes behave in a different clinical manner. To further enhance our understanding of nasal glomangiopericytomas, more cases need to be reported. This may improve our ability to establish specific treatment modalities for this type of neoplasm and to predict clinical outcomes.

Incidental Detection of Subcutaneous Myopericytoma of Trunk on FDG PET/CT and Bone Scintigraphy for Imaging of Colon Cancer

Myopericytoma is a rare type of unusual soft tissue tumor with perivascular myoid differentiation. A 53-year-old man with the diagnosis of colon cancer was referred to Tc-MDP bone scan and F-FDG PET/CT for staging. A subcutaneous mass located in right lower back with heterogeneous FDG uptake was detected on PET/CT. There was increased osteoblastic activity on MDP bone scan in the same region. Mass was resected and subsequently confirmed as myopericytoma by histopathology.

The molecular mechanisms on glomangiopericytoma invasion

PURPOSE

To observed the imaging and pathological features of the glomangiopericytoma.

EXPERIMENTAL DESIGN

In this paper we report a typical case of glomangiopericytoma arising in the skull base area and summarize the clinical manifestations, imaging and pathological features of such diseases.

RESULTS

Immunohistochemical staining confirmed the tumor cells were strongly positive to Vim, SMA, MSA and negative to CD31, CD34. Partial cells were positive to FVIII. The imaging can't confirm the diagnosis but indicate the the tumor has intact envelope.The cells in the tumor envelope is positive to Vim and negative SMA and FVIII. These findings were compatible with glomangiopericytoma and the cells in the tumor envelope is not glomangiopericytoma cells.

CONCLUSION

In view of the clinical and pathological features of the glomangiopericytoma, we believe that the surgery is the best treatment so far and the tumor can be resected completely. The above results can be preliminary reason to explain the low recurrence of such diseases.