Central hematopoietic organ

Reduction of the gland mass to 3.0 g was revealed in a 5-year-old child who died from acute destructive staphylococcal pneumonia during the study of the thymus. Histological examination of the thymus showed a decrease in the number of lobules of the gland, a significant decrease in the number of lymphocytes with the collapse of the stroma of lobules, inversion of layers, cyst-likeenlargement of Hassall's corpuscles. Which of the following diagnoses is most likely?

During

autopsy

of a 9-month-old

girl's

body, which died due to severe pneumonia complicated with sepsis, lack of thymus is observed. In the lymph nodes the lymphoid follicles and cortical substance are absent; follicles of spleen are reduced in size with no light zones and plasma cells. What is the cause of such structural changes?

A child received a hit to the retrosternal region during a game. As a result of this trauma an organ located behind the restrosternal was damaged. Name this organ: