Cabrolius,
Morgagni, and others have found two spleens in one subject;
Cheselden and Fallopius report three; Fantoni mentions four found
in one subject; Guy-Patin has seen five, none as large as the
ordinary organ; Hollerius, Kerckringius, and others have remarked
on multiple spleens. There is a possibility that in some of the
cases of multiple spleens reported the organ is really single but
divided into several lobes. Albrecht mentions a case shown at a
meeting of the Vienna Medical Society of a very large number of
spleens found in the mesogastrium, peritoneum, on the mesentery
and transverse mesocolon, in Douglas' pouch, etc. There was a
spleen "the size of a walnut" in the usual position, with the
splenic artery and vein in their normal position. Every one of
these spleens had a capsule, was covered by peritoneum, and
exhibited the histologic appearance of splenic tissue. According
to the review of this article, Toldt explains the case by
assuming that other parts of the celomic epithelium, besides that
of the mesogastrium, are capable of forming splenic tissue.
Jameson reports a case of double spleen and kidneys. Bainbrigge
mentions a case of supernumerary spleen causing death from the
patient being placed in the supine position in consequence of
fracture of the thigh.
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