{
 "serie": "s2_AX_T1_memp",
 "n_imgs": 24,
 "s": 41.9,
 "respuesta": "**Series:** Axial T1 (non‑fat‑sat), right ankle, 24 slices ordered from the midfoot/calcaneus distally (top images) to the distal tibia/fibula proximally (bottom images). Only a T1 series is available, so fluid/edema is poorly assessable and confidence for marrow/ligament edema is limited.\n\n**Bones / marrow**\n- Distal tibia, fibula, talus, calcaneus, navicular, cuboid and visualized metatarsal bases show normal bright fatty marrow without discrete T1‑hypointense marrow replacement, fracture line or cystic lesion – no definite osteochondral lesion of the talar dome identified on T1 (medium confidence; a T1‑only sequence can miss small OCL/bone bruise).\n- No os trigonum or accessory ossicle definitively identified (medium confidence).\n- Very mild subtle heterogeneity of the talar body signal on the mid‑talus slices – most likely trabecular pattern/partial volume; not considered a definite lesion (low confidence).\n\n**Ligaments**\n- Anterolateral gutter (slices at the level of the talar dome/fibular tip): the anterior talofibular ligament is not clearly seen as a discrete thin low‑signal band; the anterolateral gutter contains ill‑defined intermediate‑signal soft tissue rather than a crisp ligament – suggestive of chronic ATFL scarring/attenuation with anterolateral soft‑tissue thickening (consistent with the remote sprain history). Medium confidence.\n- Calcaneofibular ligament, deltoid complex and syndesmotic ligaments: no gross abnormality appreciated on this sequence (low–medium confidence given T1 only).\n- Sinus tarsi / tarsal canal: interosseous and cervical ligaments visible; fat signal is largely preserved without frank replacement – no definite sinus tarsi syndrome (medium confidence).\n\n**Tendons**\n- Peroneus longus and brevis: normal round/ovoid low‑signal tendons in the retromalleolar groove and along the lateral calcaneus; peroneus longus seen normally crossing plantarly beneath the cuboid. No split tear, subluxation or gross tenosynovitis visible (medium confidence – fluid not assessable on T1).\n- Posterior tibial tendon, FDL, FHL: normal caliber and signal; no tendinosis or tear identified (medium confidence).\n- Anterior compartment (tibialis anterior, EHL, EDL) normal (medium confidence).\n- Achilles tendon: normal thickness and uniformly low signal at all levels; Kager fat pad preserved (high confidence).\n- Plantar fascia: normal thickness (medium confidence).\n\n**Joints / fluid**\n- No T1‑evident large tibiotalar or subtalar effusion; small effusions cannot be excluded on T1. No intra‑articular body identified (low–medium confidence).\n\n**Soft tissues**\n- Subcutaneous fat, musculature (FHL, abductor hallucis, quadratus plantae, intrinsics) and neurovascular bundles appear normal; no mass, no muscle atrophy or fatty infiltration (high confidence).\n\n**Impression**\n1. Ill‑defined anterolateral gutter soft tissue with poorly defined/attenuated ATFL, favoring chronic post‑traumatic ATFL scarring ± anterolateral impingement‑type soft tissue (medium confidence).\n2. No definite osteochondral lesion, fracture, tendon tear, or sinus tarsi abnormality on this T1 series. Fluid‑sensitive (PD/T2 FS or STIR) and coronal/sagittal sequences are required to confirm or exclude marrow edema, small talar dome OCL, tenosynovitis and effusion."
}