Case of Mass arising from costal cartilage

A 5 yr old girl presented with small painless hard swelling in the right 5th costal cartilage area.

2D MDCT was inconclusive. A first year PG casually suggested a 3D volume rendering to be done. So we did a 3D reconstruction and it revealed an expansile lytic mass in the right 5th costal cartilage near the costochondral junction.

Diagnosis : Benign tumour
DD
1. Hyperostosis
2. Hemangioma
3. Solitary benign enchondroma

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