Alopecia pathophysiology: Difference between revisions

Jump to navigation Jump to search
Line 36: Line 36:
*[Disease name] is transmitted in [mode of genetic transmission] pattern.
*[Disease name] is transmitted in [mode of genetic transmission] pattern.
*Genes involved in the pathogenesis of [disease name] include [gene1], [gene2], and [gene3].
*Genes involved in the pathogenesis of [disease name] include [gene1], [gene2], and [gene3].
==Associated Conditions==
*Conditions associated with the disease can be detailed in this section.
==== Template sentences ====
*The most important conditions/diseases associated with [disease name] include:
**Condition 1: A brief explanation of the condition and its association with the disease
**Condition 2: A brief explanation of the condition and its association with the disease
For an example of an associated conditions sub-section of pathophysiology, click [[Clubbing pathophysiology#Associated Conditions|here]].


==Histopathology==
==Histopathology==

Revision as of 20:37, 15 December 2020

Alopecia Microchapters

Home

Patient Information

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Alopecia from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

Diagnostic Study of Choice

History and Symptoms

Physical Examination

Laboratory Findings

Electrocardiogram

X-ray

Echocardiography and Ultrasound

CT Scan

MRI

Other Imaging Findings

Other Diagnostic Studies

Treatment

Medical Therapy

Surgery

Laser Therapy

Concealing Hair Loss

Primary Prevention

Secondary Prevention

Cost-Effectiveness of Therapy

Future or Investigational Therapies

Case Studies

Case #1

Alopecia pathophysiology On the Web

Most recent articles

Most cited articles

Review articles

CME Programs

Powerpoint slides

Images

American Roentgen Ray Society Images of Alopecia pathophysiology

All Images
X-rays
Echo & Ultrasound
CT Images
MRI

Ongoing Trials at Clinical Trials.gov

US National Guidelines Clearinghouse

NICE Guidance

FDA on Alopecia pathophysiology

CDC on Alopecia pathophysiology

Alopecia pathophysiology in the news

Blogs on Alopecia pathophysiology

Directions to Hospitals Treating Alopecia

Risk calculators and risk factors for Alopecia pathophysiology

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kiran Singh, M.D. [2] Ogechukwu Hannah Nnabude, MD

Overview

The pathophysiology of alopecia is dependent on the type of alopecia.

Pathophysiology

  • In the case of alopecia areata, the exact pathophysiology is currently unknown, however, the prevailing hypothesis is that it is as a result of T-cell–mediated autoimmunity. In androgenetic alopecia, both hormonal and genetic factors play a role in the pathogenesis.
  • In telogen effluvium, the hair loss may influenced by hormones or stress, or other unknown factors. [1] The dermatophyte infection is responsible for hair loss in tinea capitis. In anagen effluvium, the shedding of hair is under the effect of chemotherapeutic agents. In alopecia mucinosa, the infiltration of the scalp with abnormal lymphocytes is the cause. [2]

Pathogenesis

Pathogenesis is the mechanism by which a certain factor causes disease (pathos = disease, genesis = development). The term can also be used to describe the development of the disease, whether it is acute, chronic, or recurrent. It can also be used to describe whether the disease causes inflammation, malignancy, necrosis etc.

Template Sentences

IF the pathogenesis of the disease is unclear:

  • The exact pathogenesis of [disease name] is not fully understood.
  • It is thought that [disease name] is the result of / is mediated by / is produced by / is caused by either [hypothesis 1], [hypothesis 2], or [hypothesis 3].

IF the disease is infectious…

  • …and the route of transmission is known:
    • [Pathogen name] is usually transmitted via the [transmission route] route to the human host.
    • Following transmission/ingestion, the [pathogen] uses the [entry site] to invade the [cell name] cell.

IF the disease has a known genetic component:

  • [Disease name] is transmitted in [mode of genetic transmission] pattern.
  • Genes involved in the pathogenesis of [disease name] include [gene1], [gene2], and [gene3].

IF certain pathology findings are characteristic of the disease:

  • On gross pathology, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].
  • On microscopic histopathological analysis, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].

Genetics

  • Some diseases are genetic, and have particular inheritance patterns, and express different phenotypes.
  • The effect that genetics may have on the pathophysiology of a disease can be described in this section.

Template sentences

  • [Disease name] is transmitted in [mode of genetic transmission] pattern.
  • Genes involved in the pathogenesis of [disease name] include [gene1], [gene2], and [gene3].

Associated Conditions

  • Conditions associated with the disease can be detailed in this section.

Template sentences

  • The most important conditions/diseases associated with [disease name] include:
    • Condition 1: A brief explanation of the condition and its association with the disease
    • Condition 2: A brief explanation of the condition and its association with the disease

For an example of an associated conditions sub-section of pathophysiology, click here.

Histopathology

In androgenetic alopecia, there are miniaturized hair follicles with an increase in the telogen-to-anagen ratio without inflammatory reaction. In anagen effluvium, there is a decrease in anagen hair without any inflammatory response. Finally, in alopecia mucinosa, there is an infiltrate of the epidermis, dermis, and peribulbar lymphocytic infiltrate mainly anaplastic cells. In patients with alopecia areata, there is a peribulbar lymphocytic infiltrate with a decrease in the ratio of anagen to telogen hair. Telogen effluvium is characterized by an increase in the number of catagen hair. In tinea capitis, there is evidence of fungal infection as under a microscope along with a neutrophilic infiltrate.

References

  1. Yu L, Lu Z (2018) Linear alopecia areata. JAAD Case Rep 4 (10):1072-1073. DOI:10.1016/j.jdcr.2018.08.015 PMID: 30511001
  2. Davey L, Clarke V, Jenkinson E (2019). "Living with alopecia areata: an online qualitative survey study". Br J Dermatol. 180 (6): 1377–1389. doi:10.1111/bjd.17463. PMID 30501016.

Template:WikiDoc Sources