Solitary Lymph Node Metastasis From a Malignant Peripheral Nerve Sheath Tumor of the Thoracic Vertebra Revealed on FDG PET/CT

Solitary Axillary Lymph Node Metastasis From Ovarian Cancer on 18F-FDG PET/CT

ABSTRACT

Solitary axillary lymph node metastasis from ovarian cancer is rare. A 74-year-old woman who had undergone hysterectomy and bilateral salpingo-oophorectomy for ovarian cancer 2 years ago presented to our hospital with enlarged axillary lymph node. 18F-FDG PET/CT revealed left axillary lymphadenopathy with an SUVmax of 8.92. The postbiopsy pathology confirmed metastasis of poorly differentiated ovarian adenocarcinoma. This case highlights the need to consider ovarian cancer metastasis in cases of solitary axillary lymphadenopathy with intense FDG uptake, especially in patients with a recent history of ovarian cancer.

Solitary Malignant Peripheral Nerve Sheath Tumor of Lumbar Vertebra Mimicking Metastatic Malignancy

ABSTRACT

Malignant peripheral nerve sheath tumor involving solitary lumbar vertebra is extremely rare. A 72-year-old man had a chief complaint of growing lumbocrural pain for 2 months. The CT scan detected a solitary vertebral lesion, which highly supported the diagnosis of metastatic malignancy. 18 F-FDG PET/CT demonstrated that the vertebral lesion had heterogeneous intense FDG accumulation with an SUV max of 16.4. The pathological examination confirmed the diagnosis of malignant peripheral nerve sheath tumor. This case highlights that MPNST should be considered when there is solitary vertebra invasion with increased FDG uptake.