FDG PET/CT Image of Soft Tissue Aneurysmal Bone Cyst

Abstract

Soft tissue aneurysmal bone cyst is very rare. Herein, we report FDG PET/CT findings of aneurysmal bone cyst in a 19-year-old man. On conventional image, it presented as a paravertebral soft tissue mass with heterogeneous enhancement and rim eggshell-like calcification. On PET/CT, this solitary lesion had intense FDG uptake with an SUV max of 10.33. The final pathology supported a diagnosis of aneurysmal bone cyst. Our case suggests that soft tissue aneurysmal bone cyst should be regarded as a differential diagnosis of solitary paravertebral mass with intense FDG uptake.

Soft Tissue Aneurysmal Bone Cyst in the Sartorius Muscle of a 13-Year-Old Boy Mimicking Myositis Ossificans: Case Report

“…The average age at diagnosis of soft tissue aneurysmal bone cyst is 29 years old (range 7-60 years old) with a male-to-female ratio of 1:1.2. 6,7,16 Soft tissue aneurysmal bone cyst most commonly affects skeletal muscles or the subcutaneous tissues of lower limbs; followed by the arms, the shoulders, and other rarer sites that include the abdominal wall, pelvis, breasts, or carotid artery. [16][17][18] The main characteristics of previously soft tissue aneurysmal bone cysts that arose in patients younger than 13 years old are summarized in Table 1.…”

“…3 Only 39 soft tissue aneurysmal bone cyst cases have been reported to date in English literature. [4][5][6][7] Secondary cystic changes in benign and malignant tumors of bones resembling aneurysmal bone cyst are known as secondary aneurysmal bone cyst. 8 The radiological appearance of soft tissue aneurysmal bone cyst consisted of multicameral appearances, with multiple septations with low signal on T1 and T2 that demarcate spaces that display fluid-fluid levels and demonstrate enhancement after the administration of contrast, resulting in a "honeycomb appearance".…”

“…3 Only 39 soft tissue aneurysmal bone cyst cases have been reported to date in English literature. 4–7 Secondary cystic changes in benign and malignant tumors of bones resembling aneurysmal bone cyst are known as secondary aneurysmal bone cyst. 8…”