The retroperitoneal tissues above and below the kidney may be the seat of a variety of tumors, which may be benign or malignant, cystic or solid. It is generally assumed that benign tumors and cysts occur more frequently than do malignant growths, and that solid tumors are more commonly seen than the cystic type.
Gobell (1901) collected reports from the literature of 101 cases of retroperitoneal tumors, which he divided into the following groups:
No case of retroperitoneal lymphangioma is found in Gobell's collection of cases.
Mauclaire (1910) studied tumors of the retroperitoneal space and described about the same varieties as Gobell did. Magoun (1919) reported a series of 73 retroperitoneal tumors, 53 of which were operated on, 29 proving malignant, while 18 were benign; the nature of 6 was not determined. Having recently had the opportunity of studying a rare type of retroperitoneal tumor we report the following case: