Presentation on theme: "Teratomas of the Brain and Head and Neck"— Presentation transcript:
1Teratomas of the Brain and Head and Neck Grimme JD, Camacho DLA, Spampinato MV, Castillo MSection of NeuroradiologyDepartment of RadiologyUniversity of North Carolina
2We present examples of teratomas found in the brain and extracranial head and neck taken from our teaching files, collected over a 10-year period. Along with the imaging findings we discuss important clinical and pathological information regarding these lesions. Because of the presence of cysts and calcifications, both CT and MRI provide critical information that helps in formulating a differential diagnosis.
3Histologic Classification Mature type: composed of fully differentiated adult-type tissues, absent or low mitosesImmature type: fetal-type incompletely differentiated tissuesMalignant type: contains cancerous tissues such as sarcomas, carcinomas and other embryonal malignancies
4Tumor MarkersMalignant yolk sac endoderm can be an aggressive component of teratomas and these patients may have elevated levels of AFP or beta-HCG in serum and/or CSFTranscription factors GATA-4 and GATA-6 may also be elevated in mature and immature teratomas
5Clinical Features90% of teratomas are found below 20 years of age (most: years)Male-to-female ratio: 2.5:180% occur around region of 3rd ventricle; thus most symptoms are due to hydrocephalus and increased intracranial pressure
6General Imaging Features of Teratomas Heterogeneous appearancePresence of fat, cysts (mucous-laden), calcium (bone and chondroid nodules), soft tissuesEnhancing soft tissuesPresent in all types of tumorsEnhancement of capsuleHeterogeneous enhancement of soft tissue components
7Congenital TeratomaIntracranial teratomas are rare, accounting for % of intracranial tumors. They comprise 50% of congenital brain tumors (those presenting in the first 60 days of life).Above: Contrast enhanced CT of congenital teratoma shows a centrally located heterogeneous mass containing cystic/solid components and severe hydrocephalus.
8Congenital TeratomaTeratomas are typically benign tumors containing elements of all 3 germinal layers: ectoderm, mesoderm and endoderm. They develop from embryonic cells which become “misinvolved” during formation of the primitive streak in the 3rd week of life. Some of these cells become “misenfolded” as intracranial rests of tissue.Above: Axial T1 (left) and T2 (right) images of a congenital teratoma (arrows). The mass is centrally located and has a heterogeneous appearance. There is hydrocephalus.
9Pineal TeratomaTissue rests are typically found in the midline, specifically, the pineal, suprasellar and 3rd ventricle regions.Above: Contrast enhanced CT (left) and pre- (middle) and post-Gd (right) T1 images. There is peripheral enhancement on CT (arrows) and mild heterogeneous enhancement (arrows) on MRI. Ventricular air was introduced by a ventriculostomy.
10Pineal TeratomaAnother example of pineal teratoma seen on sagittal T1 (left), axial post-Gd T1 (middle) and axial T2 (right) images. There is heterogeneous signal from cystic and solid components, capsular (arrow) and tumoral enhancement.
11Suprasellar TeratomaDifferential diagnosis for a T1 bright and T2 dark includes aneurysm, dermoid, lipoma and craniopharyngioma.Above: Coronal T1 (left) and T2 (right) images of a suprasellar teratoma with considerable fatty contents.
12Suprasellar TeratomaLarge suprasellar mostly cystic mass (left: T1 coronal, right: T2 axial) initially believed to be a craniopharyngioma but proven to be a teratoma.
13Suprasellar TeratomaIntracranial teratomas usually manifest in younger children – adult presentation is unusual.Left: Suprasellar teratoma in a child. Axial FLAIR (top left) and T2 (top right) images show bright lesion. T1 sagittal images without (bottom left) and with (bottom right) Gd show heterogeneous enhancement of mass.
14Suprasellar TeratomaExample of childhood suprasellar teratomas. Axial non-contrast CT (left) and sagittal T1 image (right) demonstrate fat (arrows) in both lesions.
15Intraventricular Teratoma Axial non-contrast CT (left), axial T2 (middle) and coronal post-Gd T1 (right) images in intraventricular teratoma. Fat, cysts and calcifications (arrows) are present. The tumor shows central heterogeneous enhancement. Note associated hydrocephalus.
16Cerebellar TeratomaTeratomas are classified by cell/tissue types as mature or immature, and graded histologically from 0-3, with grade increasing with amount of immature tissues. Grade 0: only mature tissues. Grade 3: large amounts of immature tissues.Above: Cerebellum is an unusual location for teratoma. Axial contrast enhanced CT (left), axial T2 (middle) and sagittal T1 (right) images show a heterogeneous mass containing fat (arrows).
17Facial TeratomaDifferential diagnosis for a facial teratoma includes lymphatic malformation, arteriovenous malformation, hemangioma, neuroblastoma, and dermoid cyst.Above: Axial T1 pre- (left) and post-Gd (right) images show a heterogeneous cystic mass in the region of the left parotid tail with a heterogeneously enhancing solid component (arrows).
18Facial TeratomaAxial T2 (left), axial T1 (middle) and sagittal T1 (left) images of a heterogeneous mass in the left facial region with cystic and solid components, which proved to be a teratoma.
19Facial TeratomaHead and neck teratomas commonly occur in the anterior midline, usually in the oropharynx or nasopharynx, but may also involve the orbit, temporal fossa, and face. Some teratomas, especially those arising in the nasopharynx, may traverse the skull base and have extensive intracranial extension.Above: Axial CECT of a child with a large exophytic heterogeneous mass, which was originating from the oropharynx. Note the presence of fat adjacent to the coarse calcifications (arrow). C/O Dr. Bernadette Koch
20Upper Neck TeratomaCervical teratomas typically present at birth as firm ovoid masses with palpable cystic areas.Calcifications are seen on plain radiographs in up to 45% of teratomas.Above: Lateral radiograph (left) shows coarse calcifications (arrow) in an anterior upper neck teratoma in a child. Axial CT images (middle and right) of the same patient show macroscopic fat (arrows) in addition to the calcifications.
21Upper Neck TeratomaPresenting symptoms of cervical teratomas include respiratory distress, feeding difficulties and torticollis.Axial CECT image of the upper neck shows a large complex mass on the right side with cystic components and heterogeneous enhancement. Note presence of endotracheal tube. C/O Dr. Bernadette Koch
22Cervical TeratomaAbove: Post-contrast axial CT image (left) and ultrasound image (right) of a cervical teratoma. Note tracheal narrowing and deviation, and presence of calcification seen in both studies (arrows).
23Lower Neck TeratomaTeratomas comprise 9% of head and neck tumors in children.Above: Radiograph (left) and axial CT image (right) of a teratoma arising from the region of the thyroid gland, extending inferiorly into the superior mediastinum. Note leftward tracheal deviation and coarse calcifications within the mass on the CT image (arrow).
24ConclusionTeratomas involving the head and neck are rare tumors characteristically involving the midline, nearly always having a heterogeneous appearance and often containing fat and/or calcifications.
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