- A dictionary of medical eponyms

Ghon's primary lesion

Related people

A small, sharply defined shadow in roentgenographic film of the lung seen in certain cases of pulmonary tuberculosis in children. It is a calcification seen in pulmonary parenchyma and hilar nodes resulting from earlier infection with tuberculosis, and is usually the primary lesion of tuberculosis in children. The term "primary lesion" was introduced by E. Rach, who characterised it thus on an X-ray picture (in German): "Solitärer Schatten, abseits vom Hilus, mit Vorliebe nahe der Pleura inmitten hellen Lungengewebes gelegen.» The primary lesion in pulmonary tuberculosis in children. Gohn’s primary focus was first described by Joseph Marie Jules Parrot (1829-1883).


  • J. Parrot:
    Recherches sur les relations qui existent entre les lésions des poumons et celles des ganglions trachéo-bronchiques.
    Comptes rendus de la Société de biologie, Paris, 1876, sér 6, 3: 308-309.
  • A. Ghon:
    Der primäre Lungenherd bei der Tuberkulose der Kinder.
    Berlin & Wien, Urbach & Schwarzenberg, 1912.

  • E. Rach:
    Röntgendiagnostik der kindlichen Lungenerkrankungen.
    Ergebnisse der Inneren Medizin und Kinderheilkunde (Berlin), 1927, 32: 464-530.
  • E. Rach:
    Radiologisch-klinische Semiotik der kindlichen Lungenerkrankungen.
    Zeitschrift für Kinderheilkunde, Berlin, 1917, 15: 1-45.

What is an eponym?

An eponym is a word derived from the name of a person, whether real or fictional. A medical eponym is thus any word related to medicine, whose name is derived from a person.

What is Whonamedit?

Whonamedit.com is a biographical dictionary of medical eponyms. It is our ambition to present a complete survey of all medical phenomena named for a person, with a biography of that person.


Whonamedit? does not give medical advice.
This survey of medical eponyms and the persons behind them is meant as a general interest site only. No information found here must under any circumstances be used for medical purposes, diagnostically, therapeutically or otherwise. If you, or anybody close to you, is affected, or believe to be affected, by any condition mentioned here: see a doctor.