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Ulnar Neuritis
Heather Borders, MD
over 10 years ago
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Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Neoplasia Benign
Created: over 7 years ago
Updated: over 7 years ago
Tags: PEDS
Modality/Study Types: US CT
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Teenager with firm posterior neck mass.

Case Images



Clinical Notes

Pathology – Mature mesodermal (fat, skeletal muscle, bone and cartilage) but no endodermal or ectodermal elements.


US – Lobulated highly reflective mass in the deep left paraspinous musculature.

CT – Predominantly bone and fat density mass with minimal intervening soft tissue in the left posterior paraspinous region; no overt spinal or intraspinal involvement.


Mesenchymoma is a tumor composed of 2 or more cell types derived from mesodenrm (e.g., muscle, bone, cartilage, synovia, blood vessels, or fat) which may have malignant histologic features but usually have benign clinical course. Most occur in superficial locations although may occur deep in the neck, chest or abdomen. Approximately 15% of mesenchymomas can occur in pediatric patients.


Blumenthal BI, Capitanio MA, Queloz JM, et al. Intrathoracic Mesenchymoma Observations in Two lnfants. Radiology (1972); 104, 107-109.

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