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Fig. 2 | Arthritis Research & Therapy

Fig. 2

From: Increased frequency of intermetatarsal and submetatarsal bursitis in early rheumatoid arthritis: a large case-controlled MRI study

Fig. 2

Heatmap of intermetatarsal bursitis, submetatarsal bursitis, Morton’s neuroma, and diffuse submetatarsal alterations for every population. Schematic illustration in coronal view of the frequency of lesions in each compartment of the forefoot at the level of the metatarsal heads (see also supplementary Table S3). The frequency of the lesions (% of participants in the respective group) is represented by an increase in color intensity. The compartments are defined in Fig. 1. Mortons neuroma (MN) is demarcated plantar to intermetatarsal bursitis (IMB). In the subcutis, submetatarsal bursitis (SMB) is illustrated as a demarcated oval. The remainder of the subcutis represents diffuse submetatarsal alterations (DSMA). IMB, SMB, and MN are most frequently seen in RA. The second and third IMB are preferred locations whereas the fourth is the least involved. In the subcutis of RA patients, DSMA is seen under MTP 2, 3, and 4, whereas in healthy controls, this is seen under MTP 1 and 5. SMB dominates under MTP 1 and 5 in RA patients. M, metatarsal heads

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