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In medicine transillumination generally refers to the transmission of light through tissues of the body. A common example is the transmission of light through fingers, producing a red glow due to red blood cells absorbing other wavelengths of light. Organs analysed include the sinuses, the breasts and the testes.
Ranula in a female. A ranula usually presents as a translucent, blue, dome-shaped, fluctuant swelling in the tissues of the floor of the mouth. If the lesion is deeper, then there is a greater thickness of tissue separating from the oral cavity and the blue translucent appearance may not be a feature.
Transillumination test is positive when a hydrocele is present, often resulting in a misdiagnosis of epididymitis, which is more commonly associated with hydrocele. The ultrasound findings of paratesticular rhabdomyosarcoma are variable. It usually presents as an echo-poor mass [Fig. 11a] with or without hydrocele.
Positive Prehn's sign indicates there is pain relief with lifting the affected testicle, which points towards epididymitis. Another way to differentiate between epididymitis and torsion on physical examination is checking for the cremaster reflex which is classically absent in the case of torsion.
The test cavity technique is only used as a last resort when results produced by all other methods above are inconclusive. High-speed burs are used without anaesthetic, drilling through enamel, or restorations to dentine. Throughout the drilling process, the patient is asked whether a painful sensation is felt, which would indicate pulpal vitality.
He worries that a positive test result in someone without symptoms is “particularly concerning” as it would cause “significant anxiety and distress for both them and their family ...
Köhler illumination is a method of specimen illumination used for transmitted and reflected light (trans- and epi-illuminated) optical microscopy.Köhler illumination acts to generate an even illumination of the sample and ensures that an image of the illumination source (for example a halogen lamp filament) is not visible in the resulting image.
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