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In a case of sporadic ataxia, common lab investigations include checking for vitamin E, vitamin B1 (thiamine), and TSH levels to rule out treatable causes like vitamin deficiencies or thyroid disorders. Serum folate testing is not a standard investigation for sporadic ataxia. 

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Angioneurotic edema is characterized by asymptomatic facial swelling.

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Internal derangement of the TMJ can be best diagnosed by MRI.

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The reflecting layer in intensifying screens is made of titanium oxide and magnesium carbonate. This layer reflects light back toward the film, increasing the efficiency of the screen by ensuring that light photons traveling away from the film are redirected back to contribute to image formation.

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Cleidocranial dysplasia (CCD) is a genetic disorder caused by a mutation in the RUNX2 gene, not an alpha one gene. The condition is characterized by a range of symptoms, including large fontanelles and open sutures in the skull, large frontal sinuses, and dental abnormalities such as a high arch palate and prolonged retention of deciduous teeth.

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Peutz-Jeghers syndrome is associated with mutations in the LKB1/STK11 gene. This autosomal dominant disorder is characterized by gastrointestinal hamartomatous polyps and mucocutaneous hyperpigmentation, and it increases the risk of various malignancies.

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A prothrombin level of 20% normal PT is of concern for dental extractions.

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Denturism refers to the illegal practice of dentistry by unlicensed individuals who fabricate and deliver dentures directly to patients without proper dental education, licensing, or oversight. This practice bypasses necessary diagnostic, treatment planning, and follow-up care that licensed dentists provide.

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Zygoma fractures can be best viewed by occipitomental view.