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Related Concept Videos

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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Elastic Collisions: Case Study01:15

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
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Updated: Mar 7, 2026

Modeling Brain Metastasis by Internal Carotid Artery Injection of Cancer Cells
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[Collision tumor].

J Braunstein1,2, F G Holz3, K U Löffler3,4

  • 1Universitäts-Augenklinik Bonn, Ernst-Abbe-Str. 2, 53127, Bonn, Deutschland. Jennifer.braunstein@ukb.uni-bonn.de.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|February 8, 2017
PubMed
Summary
This summary is machine-generated.

A rare collision tumor of squamous cell carcinoma and basal cell carcinoma was found on a patient's lower eyelid. This unusual dual diagnosis highlights the importance of thorough histopathologic examination for periocular lesions.

Keywords:
Collision tumorFibrosing basal cell carcinomaLower eye lid lesionSquamous cell carcinoma

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Area of Science:

  • Dermatology
  • Oncology
  • Ophthalmology

Background:

  • Periocular tumors require careful diagnosis due to the sensitive location.
  • Collision tumors, where two distinct neoplasms arise at the same site, are uncommon.

Observation:

  • A 65-year-old woman presented with a painless, lower eyelid lesion exhibiting both pigmented and hyperkeratotic features.
  • The lesion was surgically resected for definitive diagnosis.

Findings:

  • Histopathology revealed a collision tumor comprising a highly differentiated squamous cell carcinoma and a fibrosing basal cell carcinoma.
  • The coexistence of these specific tumor types in a single lesion is exceptionally rare.

Implications:

  • This case underscores the diagnostic challenges and rarity of combined squamous and basal cell carcinomas in the periocular region.
  • Accurate histopathologic evaluation is crucial for identifying complex neoplastic presentations and guiding appropriate treatment strategies.