CT and MRI appearances of primary sphenoid melanoma: a rare case

Primary sphenoid melanoma is a rare tumor. A 75-year-old man presented with complaints of headache and visual complaints for a few days. CT and MRI of the brain demonstrated a sphenoid sinus mass with appearances suggesting a diagnosis of melanoma. Fine-needle aspiration biopsy confirmed the diagnosis. Other differential diagnostic considerations on CT and MRI are discussed. We also discuss the further role of contrast MRI in determining the actual extent of the tumor in the critical skull base area.     

MRI features of a solid mass-like renal lymphangioma: case report

Renal lymphangioma typically manifests as a unilocular or multilocular cystic mass in the parapelvic or perirenal spaces. A solid mass-like lymphangioma rarely occurs and thus is hard to differentiate from a renal cell carcinoma. We encountered a case of a solid mass-like renal lymphangioma that was confirmed using percutaneous biopsy. The purpose of our case report was to describe magnetic resonance imaging features, to show the differential diagnoses, and to discuss the role of percutaneous renal mass biopsy.     

椎管内硬膜外血管脂肪瘤的MRI表现

目的探讨MRI对椎管内硬膜外血管脂肪瘤的诊断价值。方法回顾性分析经手术病理证实的7例椎管内硬膜外血管脂肪瘤的MRI表现，并进行MR分型。结果7例均位于胸段椎管，其中上胸段2例，中胸段2例，下胸段3例。肿块位于硬膜外，呈梭形，长轴与脊柱纵轴平行，肿瘤的MR信号由脂肪和血管2部分构成，血管成分在T1WI呈低信号，T2WI为高信号，可明显强化，未见血管流空影。全部病例依MRI表现分3型：Ⅰ型2例，特点是血管成分稀少，呈细条状、斑点状夹杂于脂肪组织间；Ⅱ型3例，特点是血管成分呈团块状，占据瘤体的中央；Ⅲ型2例，肿瘤沿一侧或双侧椎间孔向椎管外生长，形成哑铃状外观。结论MRI是诊断此病的最佳方法，并具有相对特征性表现。MRI分型对该病的诊断和鉴别诊断有一定实用价值。     

MRI诊断胸椎旁滑膜肉瘤1例

患者 男,22岁.胸背部疼痛5月,双下肢麻木1月,加重伴双下肢无力1周入院.查体:患者呈被动体位,胸背部压痛、叩击痛,以第3胸椎棘突为重;第3胸椎平面以下感觉减退.第4胸椎平面以下感觉消失.MRI矢状位示第2胸椎体下缘至第4胸椎体平面椎管后方见椭圆形异常信号影,病灶边界清晰,T2WI示病灶主体为实性成分,中心为不均匀点片状高信号(图1),T1WI为欠均匀等信号,横断位示肿块中心位于第3胸椎板及棘突,累及第3胸椎附件、上下椎体小关节及周围软组织,脊髓受推压变窄并向右前方移位(图2).     

Chromomycosis presenting as soft-tissue mass: report of a case with MRI features

Chromomycosis is primarily a skin disease that superficially presents as slowly growing, verrucous lesions, often warty or cauliflower-like in appearance. It may occasionally create a flat, plaque-like lesion in the skin but deep-seated tumorous presentation has not previously been reported. As the lesion is limited to the cutaneous and superficial subcutaneous tissues, hitherto reported cases have been described from the view point of dermatology and, so, without MRI study. We report a patient with pathologically proven chromomycosis that produced a subcutaneous mass in the dorsum of the hand with an emphasis on MRI features.     

MRI diagnosis of epidural cervical hematoma. A case report

The epidural hematoma of the spine is a seldom disease and a neurosurgical emergency. MRI allows an early diagnosis. Only surgery can provide a good anatomical and functional prognosis.     

MRI features of epidural extramedullary hematopoiesis

A case of beta-thalassemia intermedia with spinal cord compression due to extramedullary hematopoiesis, which was successfully treated by blood transfusion, is presented. Emphasis was made on the MRI appearance of extramedullary hematopoiesis on different pulse sequences. The theories that aimed to explain the involvement of the epidural space by extramedullary hematopoiesis are discussed.     

MRI in primary intraspinal extradural hydatid disease: case report

A rare case of pathologically proven primary intraspinal extradural hydatid disease of the thoracic region with spinal cord compression is reported. The diagnosis was established preoperatively on the basis of the MRI findings. The patient underwent surgery and recovered completely. Received: 7 April 1997 Accepted: 15 July 1997     

右侧鼻腔-筛窦脊索瘤CT 和MRI 影像学表现一例

脊索瘤好发于中轴骨,以颅底及骶尾区域最为常见,发生在其他部位较罕见。笔者报道了1例经组织病理学检查结果证实的发生在右侧鼻腔-筛窦的脊索瘤病例,分别从临床症状、术前CT及MRI影像学表现、手术所见及术后组织病理学、免疫组织化学检查结果分析了该病的特点,并通过文献复习鉴别诊断,加深了对该病的认识,为临床诊断及治疗方式提供有价值的参考。     

颅内原发性黑色素细胞瘤一例

患者男,38岁.2008年11月5日因无明显诱因视物模糊2个月余,逐渐加重伴右眼胀痛、睁眼困难2周就诊.体检:神志清楚,右上睑下垂,结膜充血,右眼球突出,全身皮肤及黏膜未见异常.入院X线胸片及腹部B超未见异常.     

MR findings of a primary intramedullary malignant melanoma: case report and literature review.

A case of primary malignant melanoma of the conus medullaris depicted at MR imaging is presented. Tumoral histoimmunologic analysis revealed features of malignant melanoma. Because findings for primary melanoma outside the spinal cord were negative, the diagnosis of primary intramedullary malignant melanoma was established. This rare tumor should be suspected when T1-weighted images show signal hyperintensity and T2-weighted images show signal iso- or hypointensity, with mild contrast enhancement of the lesion. However, these features may vary depending on intratumoral bleeding and melanin content.     

颅内硬脑膜外恶性纤维组织细胞瘤一例

患儿 男，4岁。因左耳听力下降伴鼻唇沟变浅1个月入院，无头痛、头晕、恶心、呕吐及四肢抽搐等症状。体检：神志清楚，对答切题，检查合作，双侧瞳孔等大等圆，对光敏感。左枕部颅骨局部稍隆起，质硬，左侧鼻唇沟变浅，张口偏右，左眼睑不能闭合，伸舌偏左，左耳听力下降，四肢肌力正常，病理反射未引出.     

胸椎椎体上皮样血管内皮瘤一例

患者女,22岁.反复腰背部酸痛2年,病初疼痛呈间歇性,后呈持续性.体检:腰椎前屈、后伸、侧弯均受限.T12、L1棘突压痛、叩击痛,右侧腰背肌压痛.     

腮腺内面神经鞘瘤1例

患者男性,35岁。因左耳下区肿大12年伴疼痛1月就诊。患者12年前因左侧牙齿疼痛后致左侧耳下区肿大,约“鸽蛋”大小,局部疼痛,进食时加重,张口稍受限。专科检查:左侧耳下区肿大,局部弥漫性肿胀,表皮温不高,可扪及一大小约6cm×4cm×3cm肿物,边界不清,活动度可,周围局部稍有触痛,与皮肤稍有粘连。超声检查提示左侧腮腺肿大,局部呈不均质回声。     

子宫颈原发性恶性黑色素瘤1例

患者 女,40岁.因发现宫颈口肿物1年半,阴道出血20天入院.妇科检查:宫颈口可见紫黑色组织物堵塞,于宫颈左侧上下唇及左侧缘致密粘连,质硬,触及出血.     

Imaging features of pancreatoblastoma: a case report

We present a patient with pancreatoblastoma along with a discussion of various cross-sectional imaging features. The tumor was a large multilocular cystic mass with solid components in the left retroperitoneal space. There were fine internal echoes on ultrasonography, and the signal intensity was high on both T1- and T2-weighted MR images in most of the locules, suggesting the presence of hemorrhagic debris. Among the various retroperitoneal organs displaced by the tumor, only the pancreatic tail was inseparable from the mass, suggesting that the pancreatic tail was the origin of the tumor. Pancreatoblastoma should be included in the differential diagnosis when a large left upper quadrant mass with these imaging features is seen in infants and young children.     

Neurotrichinosis: a case report with MRI evaluation

Neurological complications are rare in trichinosis. A case of trichinosis involving the central nervous system documented by MRI is presented. To our knowledge, only three cases of neurotrichinosis with MRI abnormalities have been already reported. The physiopathological mechanism are discussed (transport of the parasite through the blood-stream, immuno-allergic reaction or eosinophilic neurotoxic effect).     

MRI of intracranial subependymoma: report of a case

Summary Subependymoma is a rare, benign intraventricular tumour and a case of septum pellucidum origin examined with CT and MR is reported. Well demarcated non-enhancing mass with multiple small intratumoral cysts is demonstrated on CT and MR images. The differential diagnosis from ependymoma has some therapeutic implications but may not be possible by CT or MRI.