{
 "serie": "s301_T1_TSE_SAG.",
 "n_imgs": 18,
 "s": 39.2,
 "respuesta": "**Study reviewed:** 18 sagittal T1-weighted images from right ankle/foot MRI series. Assessment is limited by single sagittal T1 sequence only; fluid-sensitive and axial/coronal images would improve evaluation of marrow edema, ligaments, tendons and cartilage.\n\n## Abnormal findings\n\n1. **Talocalcaneal coalition — middle subtalar facet/sustentacular region**  \n   - **Location:** Medial/middle subtalar joint, between the talus and calcaneus/sustentaculum tali region.  \n   - **Description:** Abnormal narrowing/irregularity and apparent bridging/loss of the normal subtalar joint cleft at the middle facet, compatible with talocalcaneal coalition, likely osseous or fibrocartilaginous.  \n   - **Confidence:** **High**\n\n2. **Associated dorsal talar beaking / hindfoot remodeling**  \n   - **Location:** Dorsal talar head/neck region.  \n   - **Description:** Prominent dorsal talar beak/spur, a common secondary sign associated with subtalar coalition. Mild adjacent hindfoot/midfoot remodeling is present.  \n   - **Confidence:** **High**\n\n3. **Pes planus / decreased medial longitudinal arch**  \n   - **Location:** Hindfoot/midfoot alignment.  \n   - **Description:** Low arch configuration with relatively horizontal calcaneus and sagging through the talonavicular/midfoot region, consistent with pes planus. Non-weightbearing MRI limits severity assessment.  \n   - **Confidence:** **Medium**\n\n4. **Mild degenerative/impingement-type spurring at the ankle/hindfoot**  \n   - **Location:** Anterior tibiotalar/talar neck region and subtalar/talonavicular region.  \n   - **Description:** Mild marginal spurring/remodeling, likely chronic and related to altered mechanics from coalition/pes planus. No gross acute osseous injury seen on this T1 series.  \n   - **Confidence:** **Medium**\n\n## Other structures\n\n- **Bones/marrow:** No acute fracture, dislocation, or aggressive marrow-replacing lesion evident on these T1 images. Physes/apophyses appear open/immature, appropriate if pediatric/adolescent.  \n- **Cartilage:** Tibiotalar cartilage surface is not well assessed on sagittal T1 alone; no obvious large osteochondral defect of the talar dome is visible. Subtalar middle facet cartilage/joint space is abnormal as above due to coalition.  \n- **Ligaments:** Major ankle ligaments are not well evaluated on this sagittal T1-only set; no displaced avulsion fragment is seen.  \n- **Tendons:** Achilles tendon, plantar fascia, and visualized flexor/extensor/peroneal tendons appear grossly intact without obvious tear on these images.  \n- **Joint fluid:** No large tibiotalar or subtalar effusion evident on T1 images.  \n- **Soft tissues:** No discrete soft-tissue mass or focal fluid collection identified on this sequence."
}