glomus tympanicum

MRI T1 without contrast

MRI T1 with contrast.
D.D.:

1-GLOMUS TYMPANICUM.----->diffuse intense enhancement.

2-MENINGIOMA.---------------->diffuse intense enhancement.

3-SCHWANOMMA.--------------->heterogenous

4-CHOLESTEYATOMA----------->no enhancement.

reference of images :http://www.google.com.eg/imgres?imgurl=http://www.radiologyteacher.com/id/3434/1038-2-0-3.jpg&imgrefurl=http://www.radiologyteacher.com/index.cgi%3F%26nav%3Dview%26DatID%3D1038&usg=__taJlL4mjZ4zOimgWGZYD3WycZ80=&h=384&w=398&sz=57&hl=ar&start=32&sig2=r5QlfWUHrLPNOk5JIwQibw&zoom=1&itbs=1&tbnid=Ghu1z5GjYWheHM:&tbnh=120&tbnw=124&prev=/images%3Fq%3Dglomus%2Btympanicum,mri%26start%3D20%26hl%3Dar%26sa%3DN%26gbv%3D2%26ndsp%3D20%26tbs%3Disch:1&ei=eL7qTO3JKcTTjAeQ7LWGAw

typanicum tumor is a benign mass that usually form on the cochlear promontory. They are the most common neoplasms of the middle ear. The two most common symtoms are pulsatile tinnitus and conductive hearing loss. Treatment for glomua tympanicum tumors is surgical removal.

http://www.google.com.eg/imgres?imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGJQ6EjBXfY8f9Y5TLBrROdzWtDTMz-NN1xRji3wNkBD3S5JBxwjNDtR1SYekm67n4HwQZyeYLWY1c91DbvVb68FefHNV4mTFMdHFXayeJPFj2YXlZWbahdZDCa6LZ-5Kf0DVntqIRm38/s400/Glomus_Tympanicum_CT_Scan_Coronal_half.jpg&imgrefurl=http://kdwillinghmri-ct.blogspot.com/&usg=___bZSk37OKsKaGhT78yzfhpTb-to=&h=312&w=400&sz=27&hl=ar&start=20&sig2=UCLVlJHgSx_tbAzuDDClTg&zoom=1&itbs=1&tbnid=Hlgp68zjDB_2TM:&tbnh=97&tbnw=124&prev=/images%3Fq%3Dglomus%2Btympanicum,mri%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=-7vqTJrrAoi6jAe0ufyFAw

diffuse intense enhancement on T1 MRI with contrast in the right middle ear.
http://www.google.com.eg/imgres?imgurl=http://www.aboutcancer.com/gk_glomus.jpg&imgrefurl=http://www.aboutcancer.com/gk_glomus.htm&usg=__f3h58gkAknerkTPmYM_ZRQuGfrw=&h=377&w=430&sz=18&hl=ar&start=14&sig2=LM7yq4FUxkMNKrkSmvCpbw&zoom=0&itbs=1&tbnid=IqXyyQXZ-nEuxM:&tbnh=110&tbnw=126&prev=/images%3Fq%3Dglomus%2Btympanicum,mri%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=ernqTI9PibqMB5WfoIcD

Glomus tympanicum tumor. Axial CT image shows a small vascular mass along the right tympanic membrane. Note the adjacent opacified mastoid air cells. Reprinted with permission. Copyright Springer-Verlag.

http://www.google.com.eg/imgres?imgurl=http://img.medscape.com/pi/emed/ckb/otolaryngology/834279-858557-860642-1874362.jpg&imgrefurl=http://emedicine.medscape.com/article/860642-overview&usg=__hb1fjsW0vEKixK8hlMYY5ek8Qsk=&h=553&w=771&sz=152&hl=ar&start=5&zoom=1&itbs=1&tbnid=vgplgzB-aACC9M:&tbnh=102&tbnw=142&prev=/images%3Fq%3Dglomus%2Btympanicum,mri%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1

facial shwanomma

section through the upper portion of the epitympanun. The labyrinthine portion of the facial nerve canal is expanded (black arrow) and an expansile lesion is present at the level of the geniculate ganglion (open arrow).

http://www.google.com.eg/imgres?imgurl=http://www.medcyclopaedia.com/upload/book%2520of%2520radiology/chapter10/nic_k10_.182.jpg&imgrefurl=http://www.medcyclopaedia.com/library/radiology/chapter10/10_2.aspx&usg=__7f6-NeEOM_vHfdYwj6vCG5pblvI=&h=342&w=300&sz=57&hl=ar&start=4&sig2=DrX7LzeqzcywrW0aYbTsCA&zoom=1&itbs=1&tbnid=_MTaaVXI74ud7M:&tbnh=120&tbnw=105&prev=/images%3Fq%3Dfascial%2Bschwanomma%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=zp_lTPmNOpWH4QaFpPXwDg

mondini malformation

Non-contrast axial CT images through the temporal bones demonstrate incomplete partitioning of the left cochlea and nonvisualization of the modiolus resulting in confluency between the middle and apical segments. Compare this to the right cochlea, which is normal. There is also abnormal dilitation of the left vestibular aqueduct.

Mondini malformation occurs when there is abnormal development of the cochlea resulting in less than 2.5 turns and incomplete formation of the modiolus.

Mondini malformation refers to an anomaly of the cochlea in which the modiolus fails to develop properly in the seventh week of fetal life, resulting in a cochlea with only 1.5 turns instead of the normal 2.5 turns. In addition, the interscalar septum between the middle and apical segments fails to form leading to a confluent, sac-like cochlea.

There is an association with an enlarged vestibular aqueduct and anomalies of the vestibules and semicircular canals. In some cases, Mondini malformation may also be associated with Pendred Syndrome (bilateral sensorineural hearing loss and goiter)

http://www.google.com.eg/imgres?imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjobFaatlj3qiNP9zcjW5P3kwR4A8vo1dW6HennIYLk_sNQPaCJDwXOx0kdF32EHnGmNFKjUBV1URdsIdDrdcn2f0p2dQFBT-j6jGIr2gY52_m-aadWputYN2ABEMXCMxol-pBrpGlsan8/s1600/2JZ0U1CR_MONDINI_CT_14_512X339_WM.JPG&imgrefurl=http://neuroradiologyonthenet.blogspot.com/2009/11/findings-non-contrast-axial-ct-images.html&usg=__KvnU61gXDQXri1zvGevPSpmYLqM=&h=339&w=512&sz=26&hl=ar&start=3&sig2=WtwPxPOOF8ZVA0TOEidJxA&zoom=1&itbs=1&tbnid=46vkbosvG4eWbM:&tbnh=87&tbnw=131&prev=/images%3Fq%3Dmondini%2Banomaly%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=44_lTJKmMZDW4gawuKzwDg

michel anomaly

Axial CT scan shows right petrous bone aplasia with absence of inner ear structures. The medial wall of the middle ear is flattened (arrow), being in close contact with the infratentorial nervous structures. Note normal differentiation of the malleus.
Coronal CT scan shows a normally developed external and middle right ear. The long process of the incus (arrow) leans against the medial middle ear wall. The oval window, the stapes, and the second portion of the facial nerve are absent. A small dehiscence of the medial wall of the middle ear (arrowhead), located at the IAM, probably corresponds to the entrance of the facial nerve.

http://www.ajnr.org/cgi/content/full/20/2/281/F1

Vestibular aqueduct syndrome.

Vestibular aqueduct syndrome. Axial CT scan of the left ear shows abnormally large vestibular aqueduct (arrow). Patient has long-standing sensorineural hearing loss.

http://www.google.com.eg/imgres?imgurl=http://download.imaging.consult.com/ic/images/S1933033207707176/gr4-midi.jpg&imgrefurl=http://imaging.consult.com/image/topic/dx/Pediatrics%3Ftitle%3DVestibular%2520Aqueduct%2520Syndrome%2520(Pediatric)%26image%3Dfig4%26locator%3Dgr4%26pii%3DS1933-0332(07)70717-6&usg=__DKF9zVa-sv-ENxvwjuO34URxngc=&h=166&w=200&sz=4&hl=ar&start=2&sig2=Y6RJ1MmmQX_qgXflwn8lHQ&zoom=1&itbs=1&tbnid=35niSprqu1odYM:&tbnh=86&tbnw=104&prev=/images%3Fq%3Dvestibular%2Baqueduct%2Bsyndrome,ct%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=H47lTM7YDcqH5Aa95PHwDg

glomus tympanicum

51-year-old woman with glomus tympanicum tumor. Axial (A) and coronal (B) thin-section CT scans of temporal bone (bone window) show 5-mm soft-tissue mass (arrow) filling hypotympanum of left middle ear cavity.

http://www.ajronline.org/cgi/content-nw/full/187/2/492/FIG16

cholesterol granuloma

A cholesterol granuloma (CG) is a special type of middle ear granulation tissue which is particularly prone to bleeding, and is a frequent cause of a haemotympanum

http://www.google.com.eg/imgres?imgurl=http://radiopaedia.org/uploads/radio/0001/6147/f9fdbef0cb4cf3606045f6c87d6383_gallery.jpg%3F1286930084&imgrefurl=http://radiopaedia.org/articles/cholesterol_granuloma&usg=__2mRldG-1RCzQr9MF7A5XsgEkac8=&h=411&w=441&sz=75&hl=ar&start=9&sig2=SifH1cSGp8VFU23uLLYrQQ&zoom=1&itbs=1&tbnid=x330tHUyp47gdM:&tbnh=118&tbnw=127&prev=/images%3Fq%3Dcholesterol%2Bgranuloma%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=JIvlTKn4AoyK4gb8hNHwDg

acquired cholesteatoma

Temporal bone, acquired cholesteatoma. Coronal T1-weighted MRI shows evident integrity of the dura without herniation of brain tissue. Gadolinium enhancement of the mastoid is seen; this corresponds with fibrosis seen at surgery.

http://www.google.com.eg/imgres?imgurl=http://img.medscape.com/pi/emed/ckb/radiology/336139-384879-2634.jpg&imgrefurl=http://emedicine.medscape.com/article/384879-overview&usg=__f4djla2Ur8Kr3Fc1gC_Gn0706eM=&h=355&w=480&sz=69&hl=ar&start=8&sig2=RvRAWgQzuDI1Ajkei-CcVg&zoom=1&itbs=1&tbnid=Bl-LN5lnpx6yEM:&tbnh=95&tbnw=129&prev=/images%3Fq%3Dmastoid%2Bcholesteatoma,ct%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=74nlTJf5Bc6B4QbZ2bXwDg

Labyrinth fistula

Labyrinth fistula - computed tomography
section through middle ear at the level of the oval window (black arrow). A large cholesteatoma fills in the middle ear and has eroded the bone covering the lateral semicircular canal (white arrow). The ossicles have been eroded.

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Acquired cholesteatoma

Acquired cholesteatoma, Prussak's space. A, Coronal CT image demonstrates a soft-tissue mass (asterisk) interposed between the lateral attic wall and the malleus head. Note the blunted scutum (arrow). B, Axial CT image again demonstrates a soft-tissue mass with remodeling of the lateral attic wall (arrow). The mass extends posteriorly through the aditus into the mastoid antrum.

http://www.google.com.eg/imgres?imgurl=http://download.imaging.consult.com/ic/images/S1933033208836166/gr24a-midi.jpg&imgrefurl=http://imaging.consult.com/image/chapter/Head%2520and%2520Neck%3Ftitle%3DTemporal%2520Bone,%2520Inflammatory%2520Disease%2520of%2520the%26image%3Dfig24%26locator%3Dgr24a%26pii%3DS1933-0332(08)83616-6&usg=__GSs3Erlu_612KKjlNvIiGq0dJs4=&h=166&w=200&sz=4&hl=ar&start=8&sig2=c4rKU9yQI5SwIZauGxFy3w&zoom=1&itbs=1&tbnid=zVKesVP7j2mOcM:&tbnh=86&tbnw=104&prev=/images%3Fq%3Dattic%2Bcholesteatoma,ct%26hl%3Dar%26sa%3DG%26gbv%3D2%26tbs%3Disch:1&ei=boflTN-eOMeB4Qb49IzwDg