“Floating tooth sign” seen in
Correct Answer: Histiocytosis-X
Description: i.e. (Histiocytosis X): (631-Basis pathology 8th) (2201-H 17th) (595-Ghai 7th)"Floating tooth sign " - radiographic examination of the mandible, erosion of the bony alveolus around the teeth, so that they seen to be floating in space. It occurs in some of histiocytosis X** (Internet)HISTIOCYTOSIS - X(Langerhans cell histiocytosis) (LCH)* Malignant proliferations of dendritic cells or macrophages and includes three clinico pathologically related conditions occuring in children - eosinophilic granuloma, Hand-Schiller Christian disease and Letterer - Siwe syndrome* Histiocytosis X comprises a variety of syndrome associated with foci of eosinophilic granuloma, Diabetes insipidus exophthalmos and punched out lytic bone lesions* The hall mark of LCH is the presence of Birbeck granules in the cytoplasm** (rod shaped structure having dilated tennis - racket like terminal end) and positivity for S-100 protein and CD la positivity**** Most common involvement is of the skeleton (80%)Odontogenic Myxoma - locally invasive and recurring tumour characterised by abundant mucoid stroma and loose stellate cellsAmeloblastoma - is the most common benign** but locally invasive epithelial odontogenic tumour* Resemblance to like admantinoma of the tibia**** Follicular pattern is the most common* Commonest site is mandible in the molar ramus areaPindborg tumor - is also known as calcifying epithelial odontogenic tumour. It resembles an ameloblastoma in that it is locally invasive and commonly identified as uni-multilocular swelling in the molar-ramus region* Scattered flecks of calcification throughout the radiolucency give rise to the term Driven SnowAppearance**Eosinophilic granuloma - (108-Dalinert 5th)* Eosinophilic granuloma can cause lytic bevelled lesion or "hole within hole 9 appearance in skull. This is due to assymetric destruction of inner + outer tables* Other characteristic bony lesions(i) 'Floating teeth' - due to lesion in jaw(ii) Vertebra plana or 'coin on edge' appearance due to collapse of vertebra(iii) "punched out lesions "Admantinoma - honey comb appearance, Soap bubble appearance* Radicular cysts (Periapical cysts) - Most common type of jaw cysts**
Category:
Medicine
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now