Giant Ganglion Cyst Arising from Iliac Wing, an Atypical Site

Ganglionic Cyst of Periosteal Origin Mimicking as Pes Anserine Bursitis - A Rare Entity and Literature Review

Introduction

Periosteal ganglion is a form of cystic swelling commonly seen around long bones of lower extremities.

Case Report

A 55-year-old male presented to outdoor clinic with gradually increasing swelling around anteromedial aspect of the right knee joint with intermittent pain on prolonged standing and walking for 8 months. Magnetic resonance imaging was suggestive of ganglionic cyst which was confirmed later by histopathological examination.

Conclusion

Ganglionic cyst of periosteal origin is a rare entity. Complete excision is the recommended treatment option; if not performed appropriately chances of recurrence are high.

Intraosseous ganglion cyst mimicking chondrosarcoma on MRI: a case report

Background

The intraosseous ganglia is a benign cyst, rarely locate in the olecranon process. As intraosseous ganglia can mimic malignant bone tumor, computed tomography (CT) is important for diagnosis even when magnetic resonance imaging (MRI) suggests malignant bone tumor, such as chondrosarcoma.

Case presentation

In this paper, we report a 42-year-old woman with intraosseous ganglia in the olecranon process of the ulna. She complained pain in right elbow for 3 weeks. MRI revealed an intraosseous mass which initially diagnosed as chondrosarcoma. However, followed computed tomography (CT) demonstrated scattered intralesional gas and no underlying mineralization, and we can exclude chondrosarcoma from diagnosis.

Conclusions

The intraosseous ganglia can mimic bone tumor in MRI; therefore, CT is essential for accurate characterization of bone tumor. Even if MR imaging strongly suggests chondrosarcoma of the bone, CT should be performed as additional study.