Figure 4
From: Fibrodysplasia Ossificans Progressiva: Clinical and Genetic Aspects
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1750-1172-6-80/MediaObjects/13023_2011_Article_341_Fig4_HTML.jpg)
Tumor-like swellings on the back representing early FOP flare-ups.
From: Fibrodysplasia Ossificans Progressiva: Clinical and Genetic Aspects
Tumor-like swellings on the back representing early FOP flare-ups.