lesion

Examples of lesion in the following topics:

• Other Fungi Involved in Respiratory Disease

  • The lesion starts off small and painless, and ranges in color from pink to purple.
  • Left untreated, the lesion becomes larger and looks similar to a boil.
  • More lesions will appear, until a chronic ulcer develops.
  • Usually, cutaneous sporotrichosis lesions occur in the finger, hand, and arm.
  • The symptoms include weight loss, anorexia, and the appearance of bony lesions.

• Trochlear (IV) Nerve

  • Thus a lesion of the trochlear nucleus affects the contralateral eye.
  • Lesions of all other cranial nuclei affect the ipsilateral side (except of course the optic nerve, cranial nerve II, which innervate both eyes).
  • The clinical syndromes can originate from both peripheral and central lesions.
  • A peripheral lesion is damage to the bundle of nerves, in contrast to a central lesion, which is a damage to the trochlear nucleus.

• Injuries to Nerves Emerging from the Brachial Plexus

  • Lesions in nerves of the brachial plexus are classified as obstetric or traumatic as a result of shoulder trauma, inflammation, or tumors.
  • Brachial plexus injuries, or lesions, are caused by damage to those nerves.
  • But in general, brachial plexus lesions can be classified as either traumatic or obstetric.
  • An upper brachial plexus lesion occurs from excessive lateral neck flexion away from the shoulder.
  • Most commonly, forceps delivery or falling on the neck at an angle causes upper plexus lesions leading to Erb's palsy.

• Studying the Brain

  • A lesion is a general term for any abnormality in tissue, usually caused by disease or trauma.
  • Lesions are important to the study of brain and behavior because if a psychologist sees a person with a partially damaged brain and then sees changes in that person’s behavior, those behavioral changes can often be attributed to the brain damage.
  • Cancerous lesion (i.e., tumor) in the brain's right cerebral hemisphere from lung cancer, shown on T1-weighted magnetic resonance imaging with intravenous contrast.
  • This image shows the location of a brain lesion on the left hemisphere which caused the patient to experience partial paralysis on their right bicep.

• Syphilis

  • However, the lesion may take on almost any form.
  • Occasionally, multiple lesions may be present, with multiple lesions more common when co-infected with HIV.
  • The lesion may persist for three to six weeks without treatment.
  • All of these lesions harbor bacteria and are infectious.
  • The lesions characteristically do not itch, but may itch in some patients.

• Syphilis

  • The lesion, however, may take on almost any form.
  • Occasionally, multiple lesions may be present (~40%), with multiple lesions more common when coinfected with HIV.
  • Lesions may be painful or tender (30%), and they may occur outside of the genitals (2–7%).
  • The lesion may persist for three to six weeks without treatment.
  • All of these lesions harbor bacteria and are infectious.

• Pressure Ulcers

  • Pressure ulcers, or bedsores, are lesions cause by unrelieved pressure that blocks blood flow to the skin, causing severe illness or death.
  • Pressure ulcers, also known as decubitus ulcers or bedsores, are lesions caused by pressure on soft tissues overlying a bony prominence which reduces or completely obstructs the blood flow to the superficial tissues.

• Blastomycosis

  • Skin lesions, usually asymptomatic, that appear as ulcerated lesions with small pustules at the margins

• Human Papillomavirus (HPV)

  • Persistent infection with "high-risk" HPV types — different from the ones that cause skin warts — may progress to precancerous lesions and invasive cancer.
  • However, when the infection persists — in 5% to 10% of infected women — there is high risk of developing precancerous lesions of the cervix, which can progress to invasive cervical cancer.
  • This process usually takes 10–15 years, providing many opportunities for detection and treatment of the pre-cancerous lesion.
  • Progression to invasive cancer can be almost always prevented when standard prevention strategies are applied, but the lesions still cause considerable burden necessitating preventive surgeries, which do in many cases involve loss of fertility.

• Association Areas

  • Other methods, such as the lesion method, are not as well known, but are still very influential in today's neuroscientific research.
  • *In the lesion method, patients with brain damage are examined to determine which brain structures were damaged and to what extent this influences the patient's behavior.
  • The concept of the lesion method is based on the idea of finding a correlation between a specific brain area and an occurring behavior.
  • For example, a patient with a lesion in the parietal-temporal-occipital association area has an agraphia that means that he is not able to write although he has no deficits in motor skills.