Aneurysmal bone cyst secondary to a giant cell tumor of the patella: A case report

Abstract

Abstract.The patella is an unusual location for primary and metastatic bone tumors to develop. The most frequently encountered primary osteolytic lesions at the patella include giant cell tumors of the bone (GCT), chondroblastoma and aneurysmal bone cysts (ABC). However, the presentation of an ABC originating secondary to a GCT at the patella is rare. The present study describes such a case in a 46-year-old female. The differential diagnosis of the condition was extensive. The patient underwent curettage and the addition of bone cement to fill the defect. Pathological analysis of the resected tissue demonstrated that the lesion was consistent with an ABC forming secondary to a GCT. A 3-month follow-up was completed subsequent to the surgery, with a computed tomography scan demonstrating no evidence of recurrence. However, frequent and continuous observations of the patient following diagnosis are planned in order to evaluate the long-term efficacy of the surgical treatment. To the best of our knowledge, the present study describes the third reported case in the literature of this rare, double synchronous, benign tumor located at the patella.

Repeated Multiple Neurofibromatosis Type 1 in the Right Lower Limb: A Case Report

“…Following surgical treatment, the patient was symptom-free at the 6-month follow-up. Although he remains well and without abnormalities, owing to the risk for recurrence and additional risk for malignancy, long-term follow-up should be continued, with particular attention to signs of malignancy [ 23 ]. In conclusion, the present case highlights the rare manifestation of NF1 as a soft tissue neurofibroma.…”

Giant Cell Tumor with Secondary Aneurysmal Bone Cyst of the Patella: A Case Report

“…Overall the diagnosis relies on histopathology only. Again, on biopsy, if the material is aspirated from the cystic space, it may reveal hemorrhage and mislead the diagnosis or point towards ABC only [7,9]. Hence, multiple specimens from cystic as well as solid areas of tumors are essential to confirm the diagnosis from histopathology.…”

“…Hence, multiple specimens from cystic as well as solid areas of tumors are essential to confirm the diagnosis from histopathology. Low et al and Yo et al have warned that a small biopsy and limited sample may be mischievous in combined ABC and GCT [7,9].…”

“…Although the combined GCT and ABC may sound interesting, ABC has no implications as far as the management or the outcome of treatment of GCT is concerned [6-9]. However, it is surprising to see some of the previous reports in which the authors have directly proceeded for surgery without doing a tissue diagnosis in the preoperative period [7-8]. Song et al and Yu et al cited many differential diagnoses (GCT, ABC, telangiectactic osteosarcoma, and giant cell reparative granuloma) based on clinical and radiological findings, but they all directly went for surgery without preoperative or intraoperative tissue diagnosis [7-8].…”

“…However, it is surprising to see some of the previous reports in which the authors have directly proceeded for surgery without doing a tissue diagnosis in the preoperative period [7-8]. Song et al and Yu et al cited many differential diagnoses (GCT, ABC, telangiectactic osteosarcoma, and giant cell reparative granuloma) based on clinical and radiological findings, but they all directly went for surgery without preoperative or intraoperative tissue diagnosis [7-8]. The role of tissue diagnosis using a core needle biopsy can neither be overlooked nor underestimated [15].…”