A Right Hip Mass in a 65-Year-Old Male
Natasha Darras, MD and Vanda Torous, MD
Presentation Date: February 1, 2016; Expires: February 28, 2019
Describe the cytomorphologic features of this lesion.
Describe the histologic features and immunohistochemical staining pattern of this lesion.
Know the differential diagnosis for this lesion.
A 65-year-old male with a history of prostate cancer (status-post radical prostatectomy with salvage external beam radiation therapy approximately 5 years ago) presents with worsening back pain. A CT scan reveals a pathologic T9 compression fracture as well as a heterogeneously enhancing right adductor muscle soft tissue mass. A subsequent MRI of the right hip further characterizes the lesion as a malignant-appearing 10 x 6.4 x 4.8 cm enhancing soft tissue mass with foci of necrosis and hemorrhage. A CT-guided fine needle aspiration with a concurrent core biopsy (without touch preparation) of this right adductor soft tissue mass were performed.