Related Experiment Video
Updated: Aug 15, 2026

06:03
Use of Electromagnetic Navigational Transthoracic Needle Aspiration (E-TTNA) for Sampling of Lung Nodules
Published on: May 23, 2015
Cellular atypia in a rheumatoid nodule: a diagnostic pitfall of aspiration biopsy
Abstract:
A 63-year-old cachectic white male developed subcutaneous scalp nodules. Clinically these were felt most likely to represent metastatic tumor, although the patient was known to have rheumatoid arthritis. Aspiration cytology was interpreted as malignant due to the presence of atypical cells, but tissue biopsies demonstrated necrotizing palisading granulomas. The diagnostic hazard of cellular atypia in rheumatoid nodules is discussed.

