{
 "serie": "s301_T1_TSE_SAG.",
 "n_imgs": 18,
 "s": 52.2,
 "respuesta": "**Series: Sagittal T1 TSE, right ankle (18 slices, medial → lateral)**\n\n**Bones / marrow**\n- Distal tibia, fibula, talus, calcaneus, navicular, cuneiforms and visualised metatarsals show normal fatty marrow signal. No fracture line, no marrow-replacing lesion. Confidence: high.\n- Talar dome: contour appears smooth on the medial and central slices. I do not identify a definite osteochondral lesion (no subchondral low-signal focus, cyst or contour depression) on this T1 series. Confidence: medium (T1 alone is limited for early OCL; fluid-sensitive series needed).\n- Anterior tibial plafond lip: subtle beaking/small anterior osteophyte on the mid/lateral sagittal slices, raising the possibility of early anterior (bony) impingement. Confidence: low.\n- Posterior talus: prominent posterior (lateral) tubercle with a faint cleft on the mid slices – possible Stieda process / small os trigonum; no surrounding marrow abnormality. Confidence: low.\n- Calcaneus, including the tuberosity and Achilles insertion: normal. No calcaneal spur. Confidence: high.\n\n**Joints / cartilage**\n- Tibiotalar cartilage appears preserved in thickness; no joint space narrowing. Confidence: medium.\n- Subtalar (posterior facet) and Chopart joints: congruent, normal. Confidence: high.\n- Anterior tibiotalar recess / anterolateral gutter: intermediate-signal soft tissue filling the anterior gutter on the lateral talar-dome slices and anterior to the fibular tip, more than expected for normal capsule – suggestive of synovial thickening / scar (anterolateral impingement pattern after remote sprain). Confidence: medium.\n- No convincing large effusion (limited assessment on T1). Confidence: low-medium.\n\n**Ligaments**\n- Anterior talofibular ligament region (anterior to lateral malleolus): heterogeneous, ill-defined intermediate signal rather than a crisp low-signal band – compatible with chronic ATFL scarring/thickening from the prior sprain. Confidence: low-medium (best assessed on axial images).\n- Sinus tarsi: fat signal preserved, cervical ligament visible as a normal low-signal band; no fat replacement. Confidence: medium-high.\n- Deltoid (medial slices): grossly normal low signal. Confidence: medium.\n- Spring ligament / plantar structures: no abnormality seen. Confidence: medium.\n\n**Tendons**\n- Achilles tendon: normal thickness and uniform low signal throughout, normal insertion; Kager's fat pad clean. Confidence: high.\n- Posterior tibialis / FDL / FHL (medial slices): normal calibre and signal; no tenosynovial thickening evident on T1. Confidence: medium.\n- Peroneal tendons (lateral slices, behind and below the fibula): followed as continuous low-signal structures; no definite split, thickening or subluxation. Confidence: medium (partial visualisation on this plane).\n- Anterior tendons (tibialis anterior, EHL, EDL): normal. Confidence: medium.\n\n**Soft tissues**\n- Plantar fascia: normal thickness at the calcaneal origin. Confidence: high.\n- Plantar fat pad and intrinsic muscles: normal. No soft-tissue mass, no subcutaneous oedema evident. Confidence: high.\n\n**Summary / impression**\n1. Soft-tissue thickening in the anterolateral gutter with an ill-defined, scarred-appearing ATFL – findings consistent with sequelae of the remote lateral ankle sprain and possible anterolateral soft-tissue impingement (medium confidence).\n2. Subtle anterior tibial lip beaking (low confidence) – possible early anterior impingement.\n3. Possible Stieda process/os trigonum without reactive change (low confidence).\n4. No osteochondral lesion of the talar dome identified on T1; no fracture, marrow lesion, tendon tear, or Achilles/plantar fascia abnormality.\n\nRecommend correlation with the fluid-sensitive (PD/T2 FS) and axial sequences to confirm ATFL status, exclude occult talar dome OCL, and assess for effusion/synovitis."
}