We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |

Extramedullary Erythropoiesis in the Livers of Premature Infants

AMA Am J Dis Child. 1956;91(3):245-249. doi:10.1001/archpedi.1956.02060020247006.
Text Size: A A A
Published online


INTRODUCTION  In routine microscopic examination of tissue from premature infants post mortem, great variation in the amount of extramedullary hematopoiesis is observed.In infants of a given birth weight the number of sites of extramedullary hematopoiesis and the amount in each organ varies greatly. An attempt has been made to evaluate some of the factors affecting extramedullary hematopoiesis.

METHODS  Since the widest variations seemed to occur in infants with birth weights between 500 and 2000 gm., this group was selected for study. In order to minimize changes in hematopoiesis due to age or postnatal disease, only those premature infants who died within 72 hours of birth were included. Within these limits of birth weight and age at death, consecutive cases were studied. Over a period of three years and two months, from January, 1950, to March, 1954, postmortem examination was made of 327 premature infants. Of this number, 205 fulfilled


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

First Page Preview

View Large
First page PDF preview





Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.