Case report: Aneurysmal bone cyst arising from the anterior ethmoid sinus

Aneurysmal Bone Cyst of the Orbit With USP6 Gene Rearrangement

“…Most commonly ABCs recur within 2 years, with a higher frequency within the first year. 12,13,28 Of the cases found in this literature review, recurrences occurred between 3 and 6 months postoperatively, at a rate of 6.25% ( Supplemental Digital Content 1, http://links.lww.com/IOP/A342 ).…”

“…3,7,13,27 These septae contain a cellular proliferation of bland spindle stromal cells, frequently with evidence of bone formation, with seams of osteoid associated with osteoblasts that commonly follow the contours of the fibrous septa, as well as haemosiderin laden macrophages and osteoclast-like multinucleated giant cells. 4,7,11,15,17,19,[22][23][24][25]28 There is presence of extracellular collagen, but unlike other cystic structures, there are no endothelial cells and no elastic tissues visible. [3][4][5]7 Within the ABC, cavernous spaces of varying sizes are filled with blood and serosanguinous xanthochromic fluid.…”

“…3,4,7,17,20,21,24,26 On MRI, there are multiple heterogeneous cystic spaces with fluid levels that have a hyperintense T2 and hypointense T1 signal. 2,3,9,13,14,17,20,23,24,28…”

“…1,4,7,12,16,24 It is, however, associated with a higher overall recurrence rate (18–59%). 12,23,24,28 Reconstructive techniques are varied and include titanium plates, bone grafts, and pericranial flaps. 13,17…”

“…On CT, these expansile lesions have multilobulated cystic spaces, surrounded by a thin cortical shell with peripheral calcification, resulting in a soap-bubble appearance. [2][3][4]7,14,[20][21][22][23][24][26][27][28] Shifting fluid levels can be seen due to hemorrhage in various stages of lysis. 3,4,7,17,20,21,24,26 On MRI, there are multiple heterogeneous cystic spaces with fluid levels that have a hyperintense T2 and hypointense T1 signal.…”