{
 "serie": "s5_SAG_T1_memp",
 "n_imgs": 16,
 "s": 59.8,
 "respuesta": "**Series: Sagittal T1 (lateral → medial), right ankle. Limitation: T1-only – marrow edema, fluid and ligament tears are far less conspicuous than on fluid-sensitive sequences, so confidence is tempered accordingly.**\n\n**Bones / marrow**\n- Tibia, fibula, talus, calcaneus, navicular, cuboid, cuneiforms: normal T1 marrow signal, no fracture line, no focal marrow-replacing lesion. No T1 evidence of osteochondral lesion of the talar dome (subchondral marrow remains bright on the medial and lateral dome slices) – **high confidence for absence of a large OCL; small lesion cannot be excluded on T1 alone.**\n- Small anterior tibial plafond lip/spur with subtle contour irregularity of the anterior talar neck (slices 10–12), compatible with mild anterior (kissing) osteophytes / early anterior bony impingement – **medium-low confidence.**\n- No os trigonum, no calcaneal enthesophyte, no tarsal coalition.\n\n**Joints / cartilage**\n- Tibiotalar joint space preserved; cartilage appears of uniform thickness on T1. Subtalar, talonavicular, calcaneocuboid joints congruent. No T1-visible large effusion (fluid is dark on T1; joint recesses are not distended) – **medium confidence.**\n\n**Ligaments / sinus tarsi**\n- Anterior tibiotalar joint: intermediate-signal soft tissue filling the anterior joint recess/gutter (slices 8–10), more than the expected thin capsule – possible capsular thickening/synovial scar (anterior/anterolateral soft-tissue impingement), which fits the history of remote sprain – **low-medium confidence** (needs axial/PD-FS correlation).\n- Sinus tarsi: predominantly preserved fat with intact interosseous/cervical ligament bands; mild heterogeneity on slices 9–10 – **low confidence for sinus tarsi syndrome.**\n- Posterior tibiotalar region (slices 9–10): low-signal tissue at the posterior joint line adjacent to posterior malleolus – most likely posterior tibiotalar/posterior tibiofibular ligament complex and FHL tendon rather than pathology; no posterior impinging osseous fragment – **normal, medium confidence.**\n- Lateral collateral ligaments (ATFL/CFL) are not well assessed in the sagittal plane; no gross abnormality seen.\n\n**Tendons**\n- Achilles tendon: normal thickness and uniform low signal from myotendinous junction to calcaneal insertion; pre-Achilles (Kager) fat pad normal – **high confidence.**\n- Peroneal tendons (lateral slices 4–6), tibialis posterior/FDL/FHL (medial slices 12–14), and anterior extensor tendons: normal caliber and low signal; no tenosynovial distension evident on T1 – **medium confidence.**\n\n**Plantar / soft tissues**\n- Plantar fascia thin and low signal at calcaneal origin; heel fat pad normal. Abductor hallucis and other intrinsic muscles normal. No soft-tissue mass; subcutaneous tissues normal.\n\n**Impression**\n1. Mild anterior tibiotalar osteophyte formation with intermediate-signal soft tissue in the anterior joint recess – suggestive of anterior/anterolateral impingement as a sequela of prior sprain (medium-low confidence).\n2. No fracture, osteochondral lesion, tendon tear or marrow lesion identified on T1.\n3. Recommend correlation with the fluid-sensitive (PD/T2 FS) sagittal, coronal and axial series for ligament integrity (ATFL/CFL), marrow edema and effusion before finalizing."
}