73-year-old female with draining pus from foot There are inflammatory changes in the soft tissues about the calcaneus and dorsally in the mid foot. No definite evidence of osteomyelitis. There is abnormal signal intensity involving the sinus tarsus which is dark on T1-weighted images and bright on T2-weighted images compatible with synovitis. There is a rounded lesion within the navicular bone distally abutting the articular surface with the cuneiform bones which demonstrates low signal intensity on T1-weighted images and mild enhancement on postcontrast images. It is associated with degenerative changes about the adjacent joint most consistent with a degenerative cyst. There are patchy tubular foci in the calcaneus which most likely represent vascular remnants. The bone marrow signal of the visualized bones is otherwise within normal limits.
1. Inflammatory changes within the soft tissues dorsally in the midfoot and about the calcaneus with no definite evidence of osteomyelitis. 2. Synovitis of the sinus tarsus.3. Degenerative cyst in the navicular bone at its articulation with the cuneiform bones.