Nasopharyngeal squamous cell carcinoma metastatic to psoas muscle.

摘要

A 50-year-old man was referred to our center for PET/CT, 12 weeks after chemoradiation for a T3N2c squamous cell carcinoma of the nasopharynx. A focus of increased uptake was seen in the left psoas muscle with SUVmax of 8.4, with a corresponding 1.7 cm hypodensity on coregis-tered CT. This was interpreted as a likely psoas abscess although metastasis could not be ruled out. Histopathology of the left iliopsoas muscle excision performed 6 weeks later, showed poorly differentiated squamous cell carcinoma. This case emphasizes the need for biopsy of suspicious findings if there is no clear clinical, laboratory, and radiological evidence of infection even if the suspected finding seems to be very unusual for a metastatic lesion.