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Related Concept Videos

Accessory Structures of the Eye01:17

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Updated: Sep 20, 2025

Application of Deep Learning-Based Medical Image Segmentation via Orbital Computed Tomography
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[Orbital tumors].

F Austein1, M Huhndorf2, P Papanagiotou3

  • 1Klinik für Neuroradiologie, Klinikum Bremen-Mitte, Sankt-Jürgen-Str. 1, 28205, Bremen, Deutschland. friederike.austein@gesundheitnord.de.

Radiologie (Heidelberg, Germany)
|January 9, 2024
PubMed
Summary
This summary is machine-generated.

Early detection of malignant orbital tumours is crucial for prompt treatment. Neuroradiological imaging, especially magnetic resonance imaging (MRI), aids in diagnosing various orbital diseases based on patient age and imaging characteristics.

Keywords:
Differential diagnosesMagnetic resonance imagingNeoplasms of the orbitNeuroradiological examinationOphthalmology

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Area of Science:

  • Ophthalmology
  • Neuroradiology
  • Oncology

Context:

  • Orbital tumours encompass diverse orbital diseases with varying origins.
  • Malignant orbital tumours necessitate early detection for timely intervention.
  • Neuroradiological imaging, particularly MRI, is vital for diagnosing orbital tumours.

Purpose:

  • To highlight the importance of early detection and diagnostic imaging in managing orbital tumours.
  • To differentiate common orbital tumours in adults and children based on clinical and imaging findings.

Summary:

  • Common orbital tumours in adults include lymphoproliferative diseases, inflammations, and secondary tumours.
  • In children, common orbital tumours are dermoid cysts, optic gliomas (pilocytic astrocytoma), and capillary haemangiomas.
  • Optic nerve sheath meningiomas predominantly affect middle-aged women, while retinoblastoma is the most common intraocular tumour in childhood.

Impact:

  • Facilitates accurate differential diagnosis of orbital tumours using imaging criteria and patient demographics.
  • Enables prompt initiation of treatment for malignant orbital tumours, improving patient outcomes.
  • Provides a framework for understanding the epidemiological and radiological characteristics of orbital neoplasms.