Cancer-Cyst varies in respect to size from the microscopic, to the circumference of the colossal cysts, in the compound cystoid. The alveoli of areolar cancer in particular - that is, the small cysts constituting alveolar-cancer, - and especially the peripheral-alveoli, grow into comprehensive cysts. The cancer-cyst contains a sero-albuminous fluid, a jelly-like (colloid) substance, and frequently cancer-parenchyma. It is not a rare thing to find - imbedded in a cancer, or independent, and remote from a heterologous growth, ascertained by its volume to be the primary seat of the cancer-production - tumors, obviously consisting of encysted-cancer parenchyma, or cancer-tubera, which, manifestly enveloped in an often stoutish fibrous capsule, are distinguishable at a glance from other uninvested accumulations of the cancerous substance. Within the encysted parenchyma, again, is sometimes lodged a smaller, filial cyst.

Upon this point and upon the development of the cancer-cyst microscopic inspection throws much light. The appropriate materials for examination are afforded more especially by cancer-masses, which, with or without the presence of voluminous cysts, exhibit to the unassisted eye, minute, limpid vesicles, or else an aciniform, glandular structure.

In such cancer-growths, besides the ordinary nucleated cells, often indeed distinguished by their eccentric forms, we discern:

1. Cells Of Notable Diameter

Cells Of Notable Diameter, up to 1/30th of a millimetre, with a very large nucleus, dilated into a clear vesicle, which approximates to, if not touches, the cell-wall. In some of these bloated nuclei, a nucleus corpuscle has become developed into a second central nucleus, which, in its turn also, contains nucleus-corpuscle.

In certain cells we find two of these advanced globular or mutually flattened nuclei, as also several without a nucleus-corpuscle, or with one which, in like manner, expands into a nucleus. Other cells contain, along with a swollen nucleus, one or more ordinary granulated or transparent, spherical or oblong nuclei, besides.