垂体脓肿的MRI和CT诊断

目的总结5例垂体脓肿的Mill和CT表现，并复习相关文献，探讨垂体脓肿的影像学诊断和鉴别诊断。资料与方法5例垂体脓肿均经手术病理证实。5例术前均行MR平扫和增强，2例行CT平扫和增强。结果5例均表现为垂体腺增大，向鞍上突出。2例CT平扫呈低密度；3例MR平扫T1WI呈低信号，T2WI呈脑脊液样高信号，2例T1WI与脑实质信号类似，T2WI呈稍高信号。2例CT增强扫描未显示明显强化征象；5例MR增强扫描均呈环形强化，4例环壁薄且均匀，1例环壁较厚。结论环形强化是垂体脓肿的影像学表现特点，MR增强扫描显示这种环形强化比CT增强扫描更优越。     

嗅神经母细胞瘤的CT和MRI诊断

目的评价CT和MRI在嗅神经母细胞瘤的诊断、分期和在临床随访中的价值。资料与方法回顾性分析12例经病理证实的嗅神经母细胞瘤的CT和MRI表现,包括肿瘤部位和大小、累及范围、骨破坏、出血和坏死以及密度和信号改变等。CT平扫4例,增强扫描3例。MRI为SET1WI和T2WI,MRI平扫10例,Gd-DTPA增强扫描9例。3例有随访CT,7例有随访MRI。结果(1)肿瘤分期:按Kadish分期标准,A期0例,B期1例,C期11例,2例伴颈部淋巴结转移。(2)信号和密度改变:MRI平扫信号均匀者6例,T1WI呈低信号,T2WI呈稍高信号;信号不均匀者4例,肿瘤内可见出血和坏死区。增强扫描9例,3例为中度不均匀强化,5例为明显不均匀强化,1例为明显均匀强化。CT平扫示肿瘤密度较均匀,与肌肉接近,增强扫描2例呈中度均匀强化,1例呈明显不均匀强化。(3)沟通瘤:肿瘤同时累及颅内外者7例,双侧额叶同时受累2例,右侧额叶受累1例,左额叶受累1例,双侧额叶及左侧岛叶、基底核同时受累2例,仅累及硬脑膜者1例。脑组织水肿6例。(4)临床随访9例,影像学检查见肿物消失3例,缩小5例,术后复发1例。结论嗅神经母细胞瘤的影像学表现无特异性。检查目的为界定肿瘤累及范围。定期影像学随访有助于及时检出复发和及时行补救治疗。     

钙化上皮瘤的影像表现及病理基础

【摘要】目的：分析钙化上皮瘤的CT及MRI表现,并探讨其病理基础。方法：回顾性分析17例经手术病理证实的钙化上皮瘤患者影像学资料并复习相关文献,其中8例行CT平扫及增强扫描,6例行MR平扫及增强检查,2例仅行CT平扫,1例先行X线片,后行MR平扫加增强检查。结果：10例CT共13个病灶。8个病灶见钙化,其中5个病灶完全钙化。2个病灶见坏死。10个病灶边界清清楚,3个瘤周见絮状稍高密度影。8例CT增强扫描共11个病灶,其中3个轻度强化,5个不均匀中度强化,3个病灶完全钙化无强化。6例MR均为单发,2例T1WI呈等信号,T2WI呈外周高中央低信号,DWI呈环状高信号,增强呈“环靶征”。2例T1WI呈等或稍高信号,T2WI呈高信号,内见微囊状更高信号,灶周可见斑片状高信号,增强不均匀强化。2例T1WI呈稍低信号,T2WI均呈稍高信号,增强不均匀强化。1例X线片呈高密度,T1WI呈低信号,T1WI压脂呈不均匀稍高信号,T2WI压脂呈高低混杂信号,增强扫描不均匀强化,以中央强化较为明显。结论：钙化上皮瘤的影像表现有一定特征,当病灶位于皮下,边界清楚,CT见广泛泥沙样或致密的局灶性钙化,MR上见微囊状改变,增强扫描轻至中度强化,尤其呈“环靶征”表现时,应考虑到PM的诊断。     

原发性脑淋巴瘤的CT及MRI诊断

目的探讨原发性脑淋巴瘤的CT及MRI影像学特征。方法对20例经手术病理证实的脑淋巴瘤患者的CT及MRI影像学表现进行回顾性分析。结果20例脑淋巴瘤患者17例单发，3例多发，共有24个病灶。其中，CT及MRI图像有以下特点：a）瘤灶多为单发，幕上多见，多为圆形或不规则形；b）CT平扫多呈等或略高密度，无钙化，MR T1WI呈略低或等信号，T2WI呈等或略高信号，瘤周水肿及占位效应相对较轻；c）CT及MRI增强扫描病灶多呈均匀明显强化，亦可不均匀呈环形或花瓣样强化。结论脑原发性淋巴瘤影像表现缺少特征性，确诊主要依靠病理检查。     

脑内原发性淋巴瘤CT及MRI诊断

目的：探讨CT和MR／对脑内原发淋巴瘤的诊断价值。方法：对12例经手术和病理证实的脑内淋巴瘤的CT和MR／影像学表现进行回顾性分析。结果：单发10例、多发2例，CT表现多为等密度或稍高密度肿块。MR／表现T1WI呈等或稍低信号，T2WI多为稍高信号，CT和MR／增强扫描多为均匀强化。结论：脑内原发淋巴瘤少见，影像学表现与颅内其它肿瘤互相重叠，CT和MR／平扫和增强扫描的应用有助于脑内淋巴瘤的诊断和鉴别诊断。     

韧带样型纤维瘤的影像学特征

目的 探讨韧带样型纤维瘤(desmoid-type fibromatoses,DF)的影像学特征.方法 回顾性分析经手术及病理证实的20例DF患者的影像和临床资料,其中原发性DF 13例,复发性7例.探讨其CT和MRI影像学特征.结果 20例DF均单发,其中12例(60.0％)边界不清,9例(45.0％)包绕血管神经,8例(40.0％)有骨膜粘连.10例行CT检查,平扫呈稍低密度,密度均匀,瘤内未见钙化及坏死区.增强扫描6例表现为中度强化,延迟扫描5例呈渐进性强化.15例行MRI检查,T1WI呈等或稍低信号,T2WI呈高于肌肉低于脂肪信号,增强扫描11例呈中等或明显不均匀强化,并随着各期相渐进性强化.其中9例(81.8％)可见条索状或小斑片状T1WI及T2WI低信号,增强后未见强化.扩散加权成像(DWI)扫描2例呈高信号,表观扩散系数(ADC)图上呈等或稍高于肌肉信号.结论 DF的CT、MRI表现具有一定特征,MR增强、动态增强及DWI扫描对DF的诊断及预后监测具有重要价值.     

6例肾平滑肌瘤的CT、MRI表现分析

目的 分析肾平滑肌瘤的CT、MRI表现,以提高对其影像学表现的认识.方法 回顾性分析6例经手术病理证实的肾平滑肌瘤CT、MRI表现.所有患者均行CT检查,其中2例加行MRI.CT、MRI均为平扫加增强扫描.结果 肿瘤长径为2～7 cm,平均4.4 cm,均有完整包膜.5例肿瘤呈类圆形,1例呈浅分叶状.4例肿瘤较小者呈均匀或较均匀,2例肿瘤较大者不均匀.CT检查肿瘤实体部分平扫密度均稍高于肾脏(与肌肉密度相似),增强扫描皮髓期均呈轻中度强化,但欠均匀,其内未见粗大血管,排泄期均呈持续性强化且比皮髓期均匀.1例MR T1WI和T2WI均呈较均匀的低信号,与肌肉信号相似,另l例T1WI和T2WI呈不均匀等低信号,2例增强扫描皮髓期均呈不均匀中度强化,排泄期均呈持续性较均匀中度强化.结论 肾平滑肌瘤罕见,与良性肿瘤中的少脂肪血管平滑肌脂肪瘤,肾癌中的乳头状癌、嫌色细胞癌、平滑肌肉瘤等较难鉴别.本组半数以上肾平滑肌瘤有以下特点:患者多为青壮年女性,肿瘤包膜完整,大部分位于肾上部或下部的肾外,CT平扫呈较均匀的较高密度,增强扫描呈持续性轻中度强化,MRI平扫呈低信号,增强扫描呈中度持续性较均匀强化.     

原发性脊柱恶性淋巴瘤的X线平片、CT、MRI研究

目的探讨原发性脊柱恶性淋巴瘤的影像学表现，评价X线平片、CT、MRI诊断的作用。资料与方法12例原发性脊柱恶性淋巴瘤患者均经穿刺或手术病理证实，均有X线平片和MRI平扫加增强扫描。5例CT检查，其中3例有增强扫描。结果12例均为非霍奇金淋巴瘤。其中颈椎1例，胸椎7例，腰椎2例，胸腰椎受累2例，共有30个椎体受累。附件受累4例，软组织肿块10例，椎管内、硬膜外肿块6例，病理性骨折3例。X线平片表现为椎体骨质破坏、椎弓根影消失、椎体压缩性骨折。CT示椎体为溶骨性骨质破坏，平扫肿瘤为中等密度，增强扫描肿瘤轻至中度强化。MR T1WI上肿瘤呈略低及等信号，T2WI上呈低、等、高多种信号，增强扫描肿瘤呈轻至中度强化。结论(1)原发性脊柱恶性淋巴瘤绝大多数为非霍奇金淋巴瘤；(2)肿瘤可侵犯相邻多个椎体，软组织肿块常较大且极少坏死，增强扫描肿瘤轻至中度强化；(3)MR T1WI上肿瘤信号较低可能与肿瘤细胞密集和含较多纤维组织有关：(4)肿瘤较易侵入椎管内沿硬膜外向上、下呈袖套状生长：(5)X线平片对发现病变及定性诊断价值有限，MRI显示骨内病灶较CT更敏感。     

恶性孤立性纤维瘤的影像学表现(附5例报道)

目的探讨恶性孤立性纤维瘤(malignant solitary fibrous tumor,MSFT)的影像学表现。方法回顾性分析5例经手术病理证实的MSFT,其中行CT检查者4例,3例行增强检查;1例行MR增强扫描。分析CT、MRI影像学特征,并与病理学结果进行对照研究。结果 5例MSFT患者中,口底1例,胸部2例,肾脏1例,盆底1例;病灶最大长径44~176mm;2例呈类圆形或椭圆形,3例形态不规则;3例边界清楚,2例边界不清;1例行MR扫描,信号不均匀,T1WI呈等高信号,T2WI呈高信号,增强扫描呈明显不均匀强化;4例行CT扫描,3例CT平扫密度不均匀,内见大小不等坏死区,1例CT平扫密度均匀,增强扫描均呈中度-明显不均匀强化。结论 SFT出现信号或密度不均匀、缺血性坏死、黏液样变性、增强后明显不均匀强化、延迟性强化等影像学特征提示MSFT可能性大。     

室管膜母细胞瘤的CT和MRI表现

目的 探讨室管膜母细胞瘤的CT和MRI表现特点及其鉴别诊断.方法 回顾性分析5例经手术病理证实的室管膜母细胞瘤患者的临床及影像学资料,5例均接受MRI平扫及增强扫描,其中2例同时接受CT平扫.结果 5例室管膜母细胞瘤中4例为单发病灶,其中1例发生于右侧额叶,3例发生于脑室内(右侧侧脑室、左侧侧脑室及四脑室各1例).1例为多发病灶,主体位于双侧额叶侵犯胼胝体膝部并脑室及鞍上池多发播散转移.肿瘤体积2.6 cm ×2.4 cm×3.4 cm～5.7 cm×5.6 cm×5.4 cm.CT平扫1例发生于左侧侧脑室内病灶表现为大片状钙化,边界清晰,瘤周无水肿,另1例发生于双侧额叶病灶表现为不均匀稍高密度,边界不清,可见大片水肿.MRI平扫T1WI多表现为等稍低信号,T2 WI呈不均匀高信号,增强扫描呈均匀或不均匀强化,3例见肿瘤内囊变.结论 CT和MR检查能准确显示室管膜母细胞瘤部位、范围及周围受累情况,但是影像学表现无特异性,定性诊断有赖于病理检查.     

Primary thyroid lymphoma: MR appearance

Magnetic resonance imaging was evaluated in six patients with primary thyroid lymphoma. Five patients had a solitary localized tumor and one had multiple tumors. These masses showed homogeneous iso- or high intensity compared with the uninvolved thyroid tissue on T1-weighted images and homogeneous high intensity on T2-weighted images. Diffuse lobulated goiter with homogeneous intensity was seen in the sixth case, where the differentiation between lymphoma and Hashimoto thyroiditis was impossible. Extrathyroidal tumor extension occurred in two cases and cervical lymphadenopathy in one case. In five of six cases, identification and staging of primary thyroid lymphoma were possible with MR imaging. Magnetic resonance imaging was comparable to CT in the detection of tumors (five cases), extrathyroidal extension (two cases), and cervical lymphadenopathy (one case). In three cases, the pseudocapsule (a low-intensity band forming the border between tumor and thyroid tissue) was detected only by MR imaging. In one case, the discrimination between tumor and uninvolved thyroid gland was clearer on MR imaging than on CT.     

骨非霍奇金淋巴瘤影像诊断

目的 :探讨骨非霍奇金淋巴瘤影像表现及诊断要点。方法 :回顾性分析 2 0例经临床和病理确诊的非霍奇金淋巴瘤病例的X线、CT及MR表现。结果 :骨原发性非霍奇金淋巴瘤 13例 ,继发性 7例 ;B细胞源性 18例 ,T细胞源性 1例 ,组织细胞性 1例。 14例侵犯单骨 ,6例侵犯多骨 ,共侵犯 2 9个骨骼 ,其中骨盆 10例次 ( 10 / 2 9) ,股骨 6例次 ( 6/ 2 9) ,脊柱6例次 ( 6/ 2 9)。X线及CT表现为溶骨型 6例 ,浸润型 4例 ,硬化型 1例 ,混合型 7例 ,囊状膨胀型 2例。 6例MRI检查 4例呈长T1、长T2 信号 ,1例呈中等混杂T1、长T2 信号 ,1例呈等T1、混杂T2 信号 ,增强后均呈斑片状不均匀强化。骨皮质广泛破坏及中断 8例 ,筛孔样破坏 4例 ,皮质完整 8例。全部有软组织肿块 ,14例呈环形 ,包绕病骨生长 ,并超越骨病变的范围 ,3例呈梭形 ,3例呈局限性。 7例有骨膜反应 ,5例合并病理性骨折。结论 :本病最常发生于骨盆、股骨及脊柱 ,多侵犯单骨 ,亦可多骨发病 ,常表现为浸润性、溶骨性及混合性骨破坏。骨破坏范围广泛 ,骨皮质破坏较轻或完整 ,巨大软组织肿块 ,并包绕病骨周围生长是其影像学特点 ,可能与肿瘤细胞产生的细胞因子有关 ,后者可控制广泛的破骨活性。诊断需密切结合临床和病理。     

Cross-sectional imaging of primary osseous hemangiopericytoma

The aim of this study was to assess cross-sectional imaging features and the value of CT and MRI in primary hemangiopericytoma of bone. In five patients with histologically proven primary osseous hemangiopericytoma CT and MR scans were evaluated retrospectively. Both CT and MRI were available in four patients each. In three patients both imaging techniques were available. On CT primary hemangiopericytoma of bone presents as an expansive lytic lesion with bone destruction and inhomogeneous contrast enhancement. Magnetic resonance imaging depicts osseous hemangiopericytoma as hyperintense lesion on T2-weighted images with intermediate signal intensity on T1-weighted images. Curvilinear tubular structures of signal void in the tumor matrix on T1-weighted images and corresponding hyperintense structures on T2-weighted and on fat-suppressed short tau inversion recovery images were present in three patients. Although cross-sectional imaging findings are non-specific, they add to the diagnosis and provide valuable information about the extent of bone destruction and local tumor spread in patients with primary osseous hemangiopericytoma. While CT demonstrates the extent of bone destruction best, MRI better visualizes medullary and soft tissue extension of the tumor. Curvilinear signal abnormalities support the diagnosis of hemangiopericytoma of bone. This imaging pattern is best visualized on fat-suppressed or contrast enhanced T1-weighted MR images.     

脊柱区淋巴瘤的MRI特征

目的 分析脊柱区淋巴瘤的MRI表现,以提高对其的认识.方法 回顾性分析经手术及穿刺病理或临床随访证实的脊柱区淋巴瘤45例,其中原发性5例,均为非霍奇金淋巴瘤(NHL);继发性4|D例,其中霍奇金淋巴瘤(HL)9例,NHL 31例(B细胞型27例,T细胞型4例).将MRI表现与临床、病理结果进行对照.结果 (1)病变部位:单部位发病者13例,多部位发病者32例.5例原发性者均为单部位发病,继发性者40例中32例为多发.(2)病变类型:骨质破坏型27例,表现为不同程度的骨质破坏,23例合并有软组织肿块,18例软组织病变的范围超过骨质破坏的范围;软组织肿块型6例,骨质破坏不明显,5例表现为椎管内外软组织肿块并经椎间孔相连,呈围椎、钻孔生长的特点;骨髓浸润型9例,表现为椎骨髓质MRI信号异常,骨皮质完整,椎旁软组织正常;脊髓浸润型3例,表现为脊髓增粗和MRI信号异常.(3)MRI表现:椎骨骨质破坏和骨髓浸润表现为T1WI低信号,T2WI低、等或高信号,压脂T2WI高信号.软组织肿块与相邻正常肌肉相比,T1WI呈均匀低信号,T2WI呈高信号.增强扫描肿块多呈轻至中度强化,坏死液化不明显.结论 脊柱区淋巴瘤多为继发性B细胞NHL,其主要表现是溶骨性骨质破坏伴较大范围的软组织肿块,肿块有经椎间孔相连围椎、钻孔生长的特点,增强扫描呈轻至中度均匀强化.     

肌肉原发非霍奇金淋巴瘤的MRI表现

目的 分析肌肉原发非霍奇金淋巴瘤的MRI表现,探讨MR诊断价值.方法 回顾性分析6例经手术病理证实的肌肉原发非霍奇金淋巴瘤6例,初诊时均无明确淋巴瘤病史,术前分别经MRT_1WI、T_2WI和T_2WI增强检查.仔细复习MR扫描结果并和手术病理作回顾性对照分析.结果 6例肌肉原发非霍奇金淋巴瘤中,位于颈部2例、上肢1例、下肢3例.6个病灶皆起源于深部肌肉并累及多个肌群,5例病灶侵犯到皮下脂肪间隙,1例累及皮肤,3例肿瘤沿着神经血管束浸润.病灶呈不规则形5例,卵圆形1例.病灶直径7.3～22.5 cm,平均13.9 cm.境界不清楚5例,清楚1例.MR T_1WI略高信号2例,略低信号4例,信号均匀;T_2WI呈略高信号2例,中等程度高信号3例,高信号1例,信号略不均匀5例,均匀1例.5例瘤内可见固有解剖结构(增粗的肌纤维、肌腱和肌间脂肪)残留.MR动态增强扫描5例,动脉期呈中等程度强化,强化较均匀2例,略不均匀3例;实质期持续强化,强化较均匀3例,略不均匀2例.结论 原发肌肉淋巴瘤在T_1WI多呈等低均匀信号,T2WI信号强度低于绝大多数软组织恶性肿瘤,也有一定的参考价值.     

MRI in the diagnosis of primary lymphoma of bone: correlation with histopathology.

Seven patients with primary non-Hodgkin lymphoma of the skeleton were examined with MRI. The results were compared to "small cell" primary malignant bone tumors. The latter showed marked hyperintensity on SE T2-weighted images; in contrast, the lymphomas appeared as inhomogeneous lesions of low signal intensity on T2-weighted images. Histologic examination with silver stains of specimens of these lesions revealed a high content of fibrous tissue, which could explain the signal behavior on MR. All seven lymphomas were located in the epiphysis or metaphysis of the appendicular skeleton; intraarticular tumor growth was demonstrated in five cases.     

颈肩部纤维组织源性肿瘤的MR和CT诊断

目的 分析颈肩部促结缔组织增生性成纤维细胞瘤及侵袭性纤维瘤病的MR、CT特征，重点讨论MRI表现的病理基础。方法 分析手术病理证实有MR或CT影像资料的颈肩部促结缔组织增生性成纤维细胞瘤4例及侵袭性纤维瘤病3例的影像表现，并与病理对照。结果 （1）4例促结缔组织增生性成纤维细胞瘤均位于颈部肌间隙中，类圆形，边界大部分清晰，1例在MRI上见包膜样改变。CT平扫为均匀低密度（2例）及等低密度夹杂改变（1例），增强后肿块强化不明显，密度改变与平扫时一致。肿瘤在T1WI上为均匀等信号（1例）或等低信号混杂改变（1例）；T2WI上2例信号相似于邻近的肌肉，不均匀伴有结节样的低信号或略高信号；增强扫描，病灶强化不明显，仍以等肌肉信号为主，伴有灶性低或略高信号。（2）3例侵袭性纤维瘤病均起源于肌肉本身，长梭形生长，长径与所侵犯的肌肉走向一致，边缘均不规则。CT平扫为等肌肉密度、边界不清晰的肿块（2例）；MRT1WI为均匀等信号的占位，边界不清晰（3例）；T2WI见夹杂条状或结节状低信号的稍高信号（2例）或均匀高信号（1例）；增强扫描肿块均明显强化，条状或结节状的低信号影及不规则的边界显示更加清晰，2例见边缘爪样浸润改变。结论 好发于不同年龄的促结缔组织增生性成纤维细胞瘤和侵袭性纤维瘤病都为纤维来源的软组织肿瘤，但影像改变完全不同，这与其不同的病理基础密切相关。MRI的诊断及鉴别诊断作用明显优于CT。     

MRI appearance of primary non-Hodgkin’s lymphoma of bone

 Objective. To evaluate the signal characteristics of primary non-Hodgkin’s lymphoma of bone on MRI. Designs and patients. Ten patients with primary non-Hodgkin’s lymphoma of bone were included in the study. T1- and T2-weighted imaging was performed. The signal intensity of the lesions was compared with that of the surrounding muscle. Results. The results of the MRI were compared with the histological findings. In the majority of cases (5/10) the lesion involved the femur. In one case each the tibia, humerus, ileum, sacrum, and skull, respectively, were affected. A soft tissue mass was present in four cases. In nine of ten cases on T1-weighted imaging the lesion was hypointense. On T2-weighted imaging seven of ten lesions were hypointense compared with muscle, one isointense and, in two cases, part of the lesion showed slightly hyperintense signal. In all ten cases the signal pattern appeared inhomogeneous. Pathological examination showed extensive fibrosis in the majority of cases. Conclusion. According to our results there is decreased signal intensity of bone marrow on both T1- and T2-weighted imaging, unlike other primary round cell tumors of bone. Because the diagnoses were established with small tissue biopsies, the reason for these findings is speculative.     

0.5 T MRI of small renal masses: value of T2-weighted and Gd-DOTA-enhanced images

We compared the value of T2-weighted and Gd-DOTA-enhanced T1-weighted images for the detection and characterisation of 33 small renal masses (14 clear cell carcinomas, 6 angiomyolipomas, 3 angiomyomas, 4 adenomas, 3 papillary carcinomas, 3 oncocytomas, 1 haemorrhagic cyst). Dynamic enhanced MRI was performed to study the tumoral vascular supply (19 cases). MRI depicted all the masses more than 1 cm in diameter, but missed all the lesions less than 1 cm (4 false-negative). The results of T2-weighted images and Gd-DOTA-enhanced images were similar as regards detection; however, Gd-DOTA-enhanced images depicted more clearly the tumours smaller than 2 cm (11 cases). MRI enabled the characterisation of only 3 masses (2 angiomyolipomas, 1 haemorrhagic cyst). New MRI features are described for oncocytomas (low signal intensity on T1-weighted images, high signal intensity on T2-weighted images, early and marked enhancement on dynamic enhanced MRI). Dynamic enhanced MRI did not contribute to the differentiation of benign from malignant tumours. Correspondence to: O. Hélénon     

Desmoplastic small round cell tumor: imaging findings associated with clinicopathologic features

PURPOSE: To describe imaging findings of desmoplastic small round cell tumor (DSCRT) and to clarify the relation between radiologic appearances and clinicopathologic features. MATERIALS AND METHODS: CT scans and MRI examinations of four male patients with histologically confirmed DSCRT (mean age = 20 years) were retrospectively analyzed. RESULTS: The common imaging finding was multiple peritoneal masses with regular contour situated within mesentery. Tumors showed central low attenuation in 75% of patients on nonenhanced CT. All tumors showed inhomogeneous enhancement on CT. Small foci of punctate calcification were identified in a part of the tumor in all patients. Bone metastases were identified on enhanced CT in two patients 2 and 8 months after diagnosis, respectively. Pleural dissemination was identified in all patients, and one patient had double-sided dissemination. T2-weighted MRI showed inhomogeneous high signal intensity, and small cysts were identified in two patients. Fluid-fluid levels were identified in six tumors on T2-weighted images, which suggested the presence of hemorrhage. Tumors had inhomogeneous signal intensity low or isointense relative to skeletal muscle on T1-weighted images. Two lesions exhibited inhomogeneous enhancement with central low intensity consistent with necrosis. CONCLUSION: Imaging studies can depict disseminated characteristics and disease extent during the clinical course of DSRCT.