{
 "serie": "s201_STIR_SAG",
 "n_imgs": 18,
 "s": 75.4,
 "respuesta": "Based on the provided sagittal STIR ankle MRI slices only:\n\n| Structure / location | Finding | Confidence |\n|---|---|---|\n| **Sinus tarsi / tarsal canal** | Prominent STIR-hyperintense fluid/edema within the sinus tarsi/anterior subtalar region, with effacement of expected low-signal fat and a small lobulated fluid-like component. This may represent sinus tarsi synovitis/ganglion-type fluid and can be seen with sinus tarsi syndrome. | **High** |\n| **Sinus tarsi ligaments** | The cervical/interosseous talocalcaneal ligament region is obscured by edema/fluid; chronic sprain/degeneration of the sinus tarsi ligament complex is suspected but not fully assessed on sagittal STIR alone. | **Medium** |\n| **Tibiotalar joint** | Small ankle joint effusion, including anterior and posterior recess fluid. Mild synovitis is possible. | **High** |\n| **Anterior tibiotalar joint** | Mild anterior capsular/recess fluid with suggestion of residual/recurrent anterior tibial/talar neck osteophytic irregularity, compatible with possible anterior ankle impingement changes in the appropriate clinical setting. STIR is limited for osteophyte characterization. | **Medium** |\n| **Subtalar joint** | Small posterior subtalar joint effusion/fluid, contiguous with prominent fluid/edema in the sinus tarsi region. | **High** |\n| **Flexor hallucis longus region** | Mild fluid tracking along the expected FHL tendon sheath posterior to the ankle/under the sustentacular region, possibly mild FHL tenosynovitis or communication from ankle/subtalar effusion. | **Medium–Low** |\n| **Lateral ligament complex** | ATFL/CFL are not well evaluated on these sagittal STIR images. There is no definite acute ligamentous edema seen, but chronic ATFL attenuation/tear cannot be excluded from this series. | **Low** |\n\nBrief assessment of other visible structures:\n\n- **Bones:** No acute fracture, stress fracture, aggressive marrow lesion, or clear talar dome marrow edema identified on these images.  \n- **Cartilage / osteochondral lesion:** No definite osteochondral lesion of the talar dome is visible on this sagittal STIR subset; cartilage assessment is limited without dedicated T1/PD-weighted images and orthogonal planes.  \n- **Achilles tendon:** Appears intact without convincing tendinosis or tear.  \n- **Plantar fascia:** No convincing plantar fasciitis or calcaneal marrow edema.  \n- **Other tendons:** No definite tendon tear identified on this sagittal STIR series.  \n- **Soft tissues:** Mild nonspecific periarticular soft tissue edema around the ankle/hindfoot, greatest near the sinus tarsi/lateral hindfoot region."
}