 Underlying the marker is a focal subcutaneous soft tissue prominence in the posterior lower neck. This lesion measures approximately 16 x 40 mm (AP x CC) and follows fat signal intensity on all sequences and with suppression on the T1 fat saturation sequence, although the lesion contains some prominent internal linear septations. There is no evidence of myelocele. The vertebral column alignment is within normal limits. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The spinal cord displays normal signal and morphology.
A mass in the posterior lower neck subcutaneous tissues likely represents a lipoma. However, given the lack of intravenous contrast administration and the presence of internal architecture in the lesion, an atypical lipomatous lesion cannot be entirely excluded. Further evaluation with post-contrast imaging may be useful.