Aneurysmal bone cyst inadvertently treated with chemotherapy-A series of three cases

Primary Aneurysmal Bone Cyst of Nasal Cavity and Sinuses in a Child: Case Report and Literature Review

INTRODUCTION

Aneurysmal bone cysts (ABCs) are a rare benign bone lesion, which are divided into primary and secondary categories, and occur mainly in the vertebra and the long tubular bones. Primary ABCs in the nasal cavity and the sinuses are rare.

CASE PRESENTATION

We reported on a one-year-old boy who suffered from progressive nasal obstruction and intermittent nosebleeds over a period of approximately 1 month. The patient had no history of trauma or surgery. Physical examination showed a red tumor in his right nasal cavity. A magnetic resonance imaging scan showed a multicystic lesion arising from the ethmoid sinus. The lesion was resected under a nasal endoscope without any complications. Histological evaluation confirmed that the lesion was an aneurysmal bone cyst. Because an osteoma was found during the surgery on the cyst, the lesion was considered secondary clinically. However, fluorescence in situ hybridization testing showed a rearrangement of the USP6 (ubiquitin-specific protease 6) oncogene on chromosome 17. No recurrence was observed after 1 year.

CONCLUSION

An ABC of the nasal cavity and sinuses in such a young child is very rare and needs to be further analyzed according to postoperative pathology and combined with a genetic examination to make a diagnosis. Endoscopic sinus surgery is an effective method of treatment for this kind of disease.

Aneurysmal Bone Cyst of the Sphenoid Body Mimicking Craniopharyngioma: A Case Report

An aneurysmal bone cyst is a locally destructive benign lesion that predominately affects the long bones. Sphenoid body involvement is rare. To date, only 19 primary aneurysmal bone cysts of the sphenoid body have been reported. We describe the case of an 18-year-old male with a one-week history of severe right eye pain and lacrimation, right-sided diplopia, right-sided headache, photophobia, nausea, and vomiting. Magnetic resonance imaging (MRI) demonstrated a lobulated lesion centered in the sphenoid body with expansion into the cavernous sinus, sellar region, and clivus. The lesion had a homogenous hyperintense T2 signal with enhancing sidewalls and minimal septations. Computed tomography (CT) angiography revealed a hypoattenuating lesion containing a substance of nine Hounsfield units, compatible with water density. The clinicoradiologic findings were consistent with a craniopharyngioma. Intraoperatively, the lesion was confirmed to contain clear fluid and have prominent arterial feeding vessels. The extradural tumor was then excised with intralesional curettage. The histopathologic analysis resulted in a diagnosis of an aneurysmal bone cyst. This case highlights the potentially non-specific and variable appearance of aneurysmal bone cysts and the need to consider it in the differential diagnosis of sphenoid bone lesions.

Primary Aneurysmal Bone Cyst and Its Recent Treatment Options: A Comparative Review of 74 Cases

(1) Background: An aneurysmal bone cyst (ABC) is a benign, locally aggressive tumor. Different treatment modalities are described in the literature i.e., en bloc resection, intralesional curettage and percutaneous sclerotherapy. (2) Methods: This single-center study is a review of 74 patients with primary ABCs who underwent a surgical treatment or polidocanol instillation. Cyst volume measurements using MRI and conventional radiographs are compared. (3) Results: The mean pre-interventional MRI-based cyst volume was 44.07 cm³ and the mean radiographic volume was 27.27 cm³. The recurrence rate after intralesional curettage with the need for further treatment was 38.2% (13/34). The instillation of polidocanol showed a significant reduction of the initial cyst volume (p < 0.001) but a persistent disease occurred in 29/32 cases (90.6%). In 10 of these 29 cases (34.5%) further treatment was necessary. After en bloc resection (eight cases) a local recurrence occurred in two cases (25%), in one case with the need for further treatment. (4) Conclusions: MRI scans are superior to biplanar radiographs in the examination of ABCs. Sequential percutaneous instillations of polidocanol are equally effective in the therapy of primary ABCs compared to intralesional curettage. However, several instillations have to be expected. In a considerable number of cases, a conversion to intralesional curettage or en bloc resection may be necessary.