Abnormalities of the external morphology of the liver
Nosokom Chron 22(3): 468-480
The anomalies of this organ mainly concern the total surface diminution or liver hypertrophy, the relation to the whole organ as far as the development of one of the lobes is concerned, the existence of numerous fissures and added lobes and finally the position of the gallbladder. A small or hypoplastic left lobe has often been found and frequently an aplasia or agenesia of this lobe. The variable position of the gallbladder and its partial or total enclosure within the hepatic substance is not an infrequent anomaly. An isolated absence of the caudate lobe has not been observed and if it does exist the anomaly is associated with the right or left hepatic lobes. The anomalies so far described are concerned with hypertrophy of the caudate lobe, particularly of the caudate and papillary processes. Concerning the quadrate lobe there may be observed a decrease or its total absence. In such a case the gallbladder will be found in the place of the round ligament and to the extreme left. On the other hand, hypoplasia or total absence of the right lobe is of rare occurrence. More frequently met is a hypertrophy of this lobe, with a . change in shape, as a consequence of partial or total atrophy of the left lobe. Two illustrations show a case of hypertrophy of the right lobe with an accompanying change in form, as a result of hypoplasia of the left lobe and the existence of a transverse fissure on the anterior and posterior surface, hypertrophy of the caudate lobe and a total absence of the quadrate lobe.