PathWays Case Study: June 13

A 10-year-old girl presented with a one-year history of a slow-growing, posterior neck mass. MRI (Picture 1) showed a 6-cm soft tissue mass deep to the trapezius muscle in the upper cervical region posteriorly, centered to the left of midline. It had predominant fat signal with multiple septations. She underwent excision of the mass, which yielded a well-circumscribed, lobulated fatty lesion with white fibrous bands (Picture 2). Microscopy is shown in Pictures 3–5.

Picture 1 - MRI
Picture 2 - Gross-Picture


Picture 3 - 4X


Picture 4 - 10X


Picture 5 - 20X


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Narges Jahanseir, M.D.
Resident, Surgical Pathology
Mayo Clinic

Karen Fritchie, M.D.
Consultant, Surgical and Medical Pathology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Sciences


Rene Revier

Rene Revier is an Editorial Assistant at Mayo Medical Laboratories. She supports Mayo Clinic PathWays and other corporate communications activities.