{
 "serie": "s501_DP_SPAIR_TRA",
 "n_imgs": 24,
 "s": 70.0,
 "respuesta": "Based on the provided axial PD fat-suppressed right ankle series only:\n\n## Abnormal findings\n\n| Structure / region | Finding | Confidence |\n|---|---|---|\n| **Tibiotalar joint** | **Small-to-moderate ankle joint effusion**, most conspicuous in the anterior recess and gutters. Mild synovitis cannot be excluded on this non-contrast sequence. | **High** |\n| **Subtalar joint / sinus tarsi** | **Small subtalar joint fluid** with fluid/edema signal extending into the **sinus tarsi**, suggesting sinus tarsi synovitis/edema. | **Medium** |\n| **Anterior talofibular ligament region** | The **ATFL is not seen as a normal taut low-signal band**; the anterolateral gutter contains fluid/scar-like signal. Appearance is compatible with **chronic ATFL tear/insufficiency** in the setting of prior sprain. | **Medium-high** |\n| **Calcaneofibular ligament region** | The **CFL region appears somewhat indistinct/thickened with adjacent fluid signal**, suspicious for chronic sprain/partial tearing. No clearly retracted complete tear is evident on these slices. | **Medium-low** |\n| **Peroneal tendon sheath** | Mild fluid signal around the **peroneal tendons** at/just below the lateral malleolus, compatible with **mild peroneal tenosynovitis**. The tendons themselves appear grossly intact without definite split tear on this series. | **Medium** |\n| **Flexor hallucis longus tendon sheath / posteromedial ankle** | **Prominent fluid tracking along the FHL tendon sheath** posterior-medial to the ankle and under the sustentaculum tali/medial hindfoot. This may represent **FHL tenosynovitis** and/or a small communicating ganglion-like fluid collection. | **Medium-high** |\n| **Cartilage / talar dome** | No definite large osteochondral defect is visible on this axial sequence. There is **subtle possible irregularity/signal at the medial talar shoulder/dome**, but this is not confidently characterized here. | **Low** |\n\n## Structures grossly normal on the provided images\n\n- **Achilles tendon:** intact, no convincing tear.\n- **Posteromedial tendons other than FHL** — tibialis posterior and flexor digitorum longus: grossly intact.\n- **Anterior extensor tendons:** grossly intact.\n- **Deltoid ligament complex:** no definite acute tear identified on these axial slices.\n- **Syndesmotic ligaments / posterior talofibular ligament:** no definite disruption seen.\n- **Bones:** no acute fracture or aggressive marrow lesion evident on this series; no convincing diffuse marrow edema.  \n- **Cartilage:** no definite high-grade diffuse tibiotalar cartilage loss seen on this limited axial fat-suppressed series."
}