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.

Peevor mentions an instance of second spleen.

Beclard and Guy-Patin have seen the spleen congenitally misplaced on the right side and the liver on the left; Borellus and Bartholinus with others have observed misplacement of the spleen.
The Pancreas .-- Lieutaud has seen the pancreas missing and speaks of a double pancreatic duct that he found in a man who died from starvation; Bonet speaks of a case similar to this last.
There are several cases of complete transposition of the viscera on record.

This bizarre anomaly was probably observed first in 1650 by Riolanus, but the most celebrated case was that of Morand in 1660, and Mery described the instance later which was the subject of the following quatrain:-- "La nature, peu sage et sans douse en debauche Placa le foie au cote gauche, Et de meme, vice versa Le coeur a le droite placa." Young cites an example in a woman of eighty-five who died at Hammersmith, London.