History:A19-year-oldwomanpresentsforanevaluationoffootpainthatsheshadforseveralmonths.Examinationwasnotablefortendernessatoneofthemetatarsophalangealjoints.
病史：19岁，女性，足部疼痛数月。体格检查示一个跖趾关节显著压痛。
MRimagesMRimagesoftheleftfootwithoutgadolinium（平扫）areshownbelow.
Inorder:protondensity,T1-weighted,andshorttauinversion-recoveryimages（质子像、T1WI、STIR）.
Q1——ThereisabnormalT2marrowsignalinthesecondmetatarsal（第2跖骨）.：ATrueBFalseQ——Thereissubluxation（半脱位）ofthesecondmetatarsophalangealjoint（跖趾关节）.ATrueBFalse Q3——Whichofthefollowingisthemostlikelyetiologyoftheabovefindings?AOsteomyelitis（骨髓炎）BOsteoidosteoma（骨样骨瘤）CGiantcelltumorofthetendonsheath（腱鞘巨细胞瘤）DPlantarfibromatosis（足底纤维瘤病）ESubchondralfracture（软骨下骨折）
Follow-upradiograph
Obliqueviewradiographofthefoottakentwoyearslaterisshownbelow.
Q4——Whichofthefollowingisdemonstratedintheaboveimage?ALoosebody（游离体）alongthemetatarsalhead（跖骨头）BFlattening（扁平）ofthemetatarsalheadCMinimallydisplacedfracture（轻微移位骨折）atthemetatarsalhead/neckjunctionDCysticchanges（囊变）inthemetatarsalhead Q5——Whicheponym（以人名命名的）isattributedtotheabovecondition?AK?hlerdiseaseBPannerdiseaseCSeversdiseaseDTrevordiseaseEFreiberginfraction/diseaseQ6——Whichmetatarsalismost北京白癜风最好的医院白癜风的治疗
