Radiofrequency ablation treatment of periacetabular chondrosarcoma: A case report

Needle biopsy of an incidental periacetabular bone lesion in an 18-year-old female showed a low-grade cartilaginous tumor. Based on the imaging and pelvic location, the tumor was considered a Grade I chondrosarcoma. Due to the young age, incidental discovery, and low metastatic potential, radiofrequency ablation (RFA) was recommended in favor over traditional wide en bloc resection. The patient has been radiographically and clinically stable for 2 years. RFA has not been previously reported for low-grade chondrosarcoma. Its use should be done only with careful consideration and diligent follow-up in this setting.

Incidental Discovery of Embryonal Rhabdomyosarcoma on CT Imaging

Rhabdomyosarcoma is an uncommon soft tissue sarcoma that rarely presents in adults. Clinical presentation is dependent on site and size. We present the case of a woman who presented with acute-onset dyspnoea and whose pathology report confirmed embryonal rhabdomyosarcoma (ERMS) seen as an incidental finding on chest computed tomography. We also describe the clinical, laboratory and radiological work-up conducted to diagnose and manage ERMS in the critical care setting.

Molecular Profile of a Pituitary Rhabdomyosarcoma Arising From a Pituitary Macroadenoma: A Case Report

Pituitary sarcoma arising in association with pituitary adenoma is an uncommon finding. Most cases of secondary sarcoma have been noted to arise with a median interval of 10.5 years post radiation. In this case report, we describe a 77-year-old man with an incidental discovery of a pituitary macroadenoma on magnetic resonance imaging (MRI) and underwent radiotherapy. Three years after radiation treatment, there was an acute change in clinical symptoms and increase in tumor size and mass effect on the optic chiasm which prompted surgical resection. A pituitary adenoma along with a separate spindle-cell sarcomatous component was identified in histology. Immunohistochemical stain for muscle markers confirmed a development of pituitary rhabdomyosarcoma (RMS). Molecular profiling of the tumor identified mutations in TP53, ATRX, LZTR1, and NF1. Despite its rarity, characterization of pituitary RMS with immunohistochemistry and molecular studies may provide an insight to its pathophysiological relationship with pituitary adenoma.