Eurocom MXM-to-PCIe x16 adapter lets you put a laptop GPU inside of a desktop PC
Much like how there are USB-A to USB-C adapters that allow USB-A devices to connect to USB-C ports, there are also MXM to PCIe adapters that allow MXM graphics cards to connect to PCIe slots as found on most desktop PC motherboards. Eurocom markets these adapters as "MXM3 to PCIe Riser Cards" with the ability to support mobile MXM3 Radeon RX 580 or GeForce RTX 2080 cards of up to 150 W TDP.
For cooling, Eurocom offers a small fan and heat sink as the original laptop cooling solution for the MXM cards will obviously not carry over.
As neat as the concept may be, however, Eurocom is marketing the riser cards for industrial users as opposed to the average gamer with prices ranging from $500 to $1300 USD. The audience will be quite small due to both the high price of entry and the limited number of MXM cards available in the first place. Most newer gaming laptops, for example, ship with soldered GeForce GPUs instead of removable MXM GPUs to reduce both weight and thickness. Still, the option is at least there for the small percentage of users who can take advantage of the MXM-to-PCIe adapter.