Aneurysmal bone cyst presenting as a pelvic mass on sonographic examination.

Sonographic findings in aneurysmal bone cyst in children: Correlation with computed tomography findings

“…10,11 Another study describes the existence of fine parallel septa in an ABC located in the pelvis. 9 The change of FFLs owing to movement of the patient has also been reported. 10 Areas of decreased echogenicity above the FFLs have been reported, and a thin echogenic outer rim and another less echogenic rim.…”

“…7,[9][10][11] Only 2 studies describe the occurrence of FFLs. 10,11 Another study describes the existence of fine parallel septa in an ABC located in the pelvis.…”

“…[1][2][3][4][5] More than 50% of these lesions occur in the metadiaphysis of long bones, but short bones, such as vertebrae (12-30%), and plane bones, such as the pelvis (2-15%), can also be involved. 1,9,12 ABCs cause various degrees of expansion and may be located centrally, eccentrically, or subperiosteally within the bone. Campanacci et al 3 classified 5 types of ABCs according to location: central, expansile, eccentric, subperiosteal, and eccentric with growth toward soft tissues and cancellous bone.…”

“…7,8 Few studies using sonography to assess this disorder have been reported. 7,[9][10][11] We prospectively evaluated the usefulness of sonography in diagnosing ABCs in children by studying the presence of internal FFLs and correlating the results with CT findings.…”

Sonography of bone and bone‐related diseases of the extremities

“…However, MSUS can provide important information when the tumor metamorphoses at the bone surface, extends into soft tissue, or destroys or thins the cortex sufficiently for transmission of sound waves. 1,[7][8][9]10,44 Aneurysmal bone cysts and giant cell tumors of the bone may create a bulge on the surface of the bone, with cortical thinning sufficient to allow beam penetration; sonography would reveal a cystlike appearance, with intraosseous fluid-fluid levels and septa. 1,[44][45][46] Sonography is also valuable in evaluating the cartilaginous cap of osteochondroma, 47 which appears as a hypoechoic layer superficial to the highly reflective bone surface, with outpouchings.…”