Blastomycosis history and symptoms

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Vidit Bhargava, M.B.B.S [2] Aditya Ganti M.B.B.S. [3]


Symptoms

Clinical manifestations of Blastomycosis range from subclinical infection to fatal disseminated disease. Symptoms can be discussed under pulmonary and extra-pulmonary presentations.

Pulmunory Blastomycosis

Presents clinically as acute and chronic.

Acute

  • The symptoms mimic with acute bacterial pneumonia presentation
  • Presents with fever, chills, productive cough, with or without hemoptysis.
  • Often self limited

Chronic

  • Symptoms last for more that 2 months.
  • Presents with weight loss, fever, night sweats, cough with sputum, and chest pain.
  • This presentation can be confused with pulmonary tuberculosis, malignancy of lung.
  • ARDS can develop as a result of endobronchial spread of infection which is dreadful complication with high mortality rate.

Extra-Pulmonary blastomycosis

The most common extra pulmonary sites involved in blastomycosis are skin, bone, genitourinary and CNS.

Cutaneous blastomycosis

  • Skin is involved in 40-80% of the cases.[1]
  • The cutaneous manifestations of blastomycosis comes in two forms verrucous and ulcerative.[2]
Verrucous Ulcerative
Location Above the subcutaneous abscess Drainout from subcutaneous abscess through skin
Morphology Irregularly shaped lesions with raised and crusted borders Heaped up borders with or without exudative base
Microscopic

findings

Blastomycosis of skin

Oseous blastomycosis

  • About 25% of the blastomycosis involve bone.
  • Osteomyelitis is the most common presentation of oseous blastomycosis.
  • Most commonly involved bones include Vertebrae, ribs, skull and long bones.
  • Infection cans spread from the involved bone to surrounding joints (purulent arthritis) or soft tissue (subcutaneous abscess with draining sinus wichh can lead to the formation of an ulcer)
  • The most common complication of vertebral osteomyelitis is extension of infection from the spine, resulting paravertebral or psoas abscess.

Genito-urinary

  • About 10 % of the blastomycosis involves genitourinary system.
  • In Men the most commonly involved organs include prostrate, testicles and epididymis.
  • Epididymo-orchitis causes swelling and pain, and prostatitis is associated with dysuria and symptoms of obstruction.
  • Involvement of female genitourinary system is rare but if involved it causes endometrial infection or tubo-ovarian abscess.

Central nervous system

  • About 5-10 % of blastomycosis involve CNS.
  • It presents as meningitis or mass lesion.
  • CSF analysis of WBC reveals neturophilic predominance.
  • Laryngeal involvement causes hoarseness.

Other sites of disease

Blastomycosis can disseminate almost to any other site such as liver, spleen, breast, lymph nodes etc.[3]


References

  1. Smith, Jeannina; Gauthier, Greg (2015). "New Developments in Blastomycosis". Seminars in Respiratory and Critical Care Medicine. 36 (05): 715–728. doi:10.1055/s-0035-1562898. ISSN 1069-3424.
  2. Kauffman, Carol (2011). Essentials of clinical mycology. New York: Springer. ISBN 978-1-4419-6639-1.
  3. Saccente, M.; Woods, GL. (2010). "Clinical and laboratory update on blastomycosis". Clin Microbiol Rev. 23 (2): 367–81. doi:10.1128/CMR.00056-09. PMID 20375357. Unknown parameter |month= ignored (help)

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