## FINDINGS

### Bones and articular cartilage
- Small focal osteochondral/subchondral abnormality at the medial talar dome/medial talar shoulder with subtle articular surface/subchondral irregularity and suspected cartilage thinning/fissuring. No displaced osteochondral fragment identified.
- Mild anterior tibiotalar marginal osteophyte/lipping involving the distal tibial plafond and dorsal talar neck, suggesting mild degenerative/anterior impingement morphology.
- Prominent posterior talar process versus small os trigonum, without definite associated marrow edema.
- No acute fracture, dislocation, or aggressive marrow-replacing lesion. Ankle mortise alignment is preserved.

### Joints / synovium
- Mild-to-moderate tibiotalar joint effusion, most conspicuous in the anterior/lateral and posterior recesses/gutters, with possible mild synovitis.
- Small posterior subtalar joint effusion.
- Mild fluid/edema-like signal in the sinus tarsi/tarsal canal region, possibly reflecting mild synovitis/scarring; small ganglion/synovial cyst component is possible. No discrete solid mass.

### Ligaments
- Anterior talofibular ligament is indistinct/attenuated with surrounding edema, suspicious for sprain or partial tear, possibly chronic/scarred. No definite complete tear is confirmed.
- Mild heterogeneity/thickening of the deltoid ligament fibers, without definite complete tear, possibly chronic sprain/scarring.
- No definite syndesmotic ligament disruption identified on the provided images.

### Tendons
- Mild fluid along the flexor hallucis longus tendon sheath posteriorly, favored mild FHL tenosynovitis versus communication with adjacent joint fluid. Tendon remains intact.
- Trace peroneal tendon sheath fluid without definite peroneal tendon split tear or rupture.
- Achilles, posterior tibial, flexor digitorum longus, and anterior extensor tendons are grossly intact.

### Plantar fascia / entheses
- Mild thickening/low-signal prominence of the proximal plantar fascia at the calcaneal origin with small plantar calcaneal enthesopathic change; mild plantar fasciitis is possible. No tear or retraction.

### Soft tissues
- Mild-to-moderate nonspecific periarticular/subcutaneous edema about the ankle/hindfoot, greatest laterally/posteriorly and at the plantar heel.
- No focal soft-tissue mass or drainable fluid collection.

## IMPRESSION

1. **Small medial talar dome/medial talar shoulder osteochondral lesion** with focal subchondral/articular surface irregularity and suspected cartilage thinning/fissuring. No displaced fragment. **Confidence: Medium.**

2. **Mild-to-moderate tibiotalar joint effusion/synovitis** and small posterior subtalar effusion. **Confidence: High.**

3. **ATFL abnormality suspicious for sprain/partial tear**, possibly chronic/scarred; no definite complete tear. Mild possible chronic deltoid sprain/scarring. **Confidence: Medium for ATFL; Low-to-medium for deltoid.**

4. **Mild sinus tarsi edema/fluid**, possibly reflecting mild synovitis/scarring or small ganglion/synovial cyst component. **Confidence: Medium.**

5. **Mild FHL tenosynovitis versus fluid communication from adjacent joint effusion.** Trace peroneal tendon sheath fluid without tendon tear. **Confidence: Medium.**

6. **Mild anterior tibiotalar degenerative/anterior impingement morphology** and mild proximal plantar fascial enthesopathic/fasciitis-type change. **Confidence: Medium.**