{
 "serie": "s601_T1W_aTSE",
 "n_imgs": 24,
 "s": 23.4,
 "respuesta": "**Limited assessment:** These are coronal T1-weighted images only. Marrow edema, cartilage injury, ligament sprains, and small amounts of fluid are not reliably assessed without fluid-sensitive sequences and additional planes.\n\n### Abnormal findings\n\n| Location | Finding | Confidence |\n|---|---|---|\n| **Middle talocalcaneal articulation, adjacent to the sustentaculum tali** | Abnormally narrowed and irregular articulation, with opposing bony remodeling and low-signal subchondral margins. Appearance is **suspicious for a nonosseous talocalcaneal coalition**, with associated reactive/degenerative change. Definite marrow continuity across the articulation is not demonstrated. | **Medium** |\n| **Sinus tarsi / adjacent subtalar soft tissues** | Partial replacement of the normally bright fat by intermediate-signal tissue, potentially representing associated fibrosis or synovial thickening. This is incompletely characterized on T1 imaging. | **Low–medium** |\n\n### Other structures\n- **Bones:** No visible acute fracture, collapse, or destructive bone lesion. No definite talar-dome osteochondral defect. Marrow edema cannot be excluded on this sequence.\n- **Cartilage/joints:** Tibiotalar joint space and posterior subtalar articulation are relatively preserved. No large joint effusion.\n- **Ligaments:** No definite discontinuity in the visualized deltoid or lateral ligament components; the individual ligaments are incompletely evaluated in this plane.\n- **Tendons:** No gross tear or retraction of the visualized Achilles, medial flexor, peroneal, or extensor tendons. Subtle tendinopathy or tenosynovitis cannot be excluded.\n- **Other soft tissues:** No discrete mass or substantial soft-tissue swelling identified.\n\n**Main impression:** Suspected **nonosseous middle-facet talocalcaneal coalition**. Confirmation requires the remaining MRI sequences/planes; CT can further characterize the bony anatomy if needed."
}