Diffuse neurofibroma of the ankle

Area of Science:

• Radiology
• Oncology
• Pathology

Background:

• Diffuse neurofibroma is a rare neoplastic proliferation of peripheral nerve sheath cells.
• Accurate diagnosis relies on correlating imaging with histological findings.

Observation:

• Computed tomography (CT) reveals diffuse infiltration of subcutaneous and deep fat, appearing isodense to muscle.
• Magnetic resonance imaging (MRI) demonstrates extensive infiltration of fat, enveloping structures without bone involvement.
• Superficial masses show homogeneous enhancement post-gadolinium, while deep infiltration exhibits a reticular pattern.

Findings:

• Post-gadolinium T1-weighted MRI sequences are optimal for visualizing tumor enhancement and non-enhancing hypointense soft tissue strands.
• MRI effectively delineates the extent of infiltration, distinguishing it from surrounding tissues.
• Advanced imaging techniques like MR angiography and Doppler ultrasound can reveal vascular abnormalities.

Implications:

• MRI, particularly with post-gadolinium T1-weighted sequences, provides a characteristic imaging signature for diffuse neurofibroma.
• This characteristic appearance aids in accurate diagnosis and surgical planning.
• Further research can explore the role of advanced imaging in differentiating benign from malignant neurofibromas.