Shock as sonogram video shows baby growing in the liver

Twitter users, including doctors, have been left confused after a sonogram video showng a baby growing in the liver was shared online.
The sonogram, taken on December 13, 2018, shows the baby moving in the liver, rather than in the womb. The poster described it as Intra-hepatic cyesis (pregnancy in the liver).

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But a lot of doctors on Twitter did not believe it was possible and expressed their shock while also asking pertinent questions.
A doctor later explained that it is possible but extremely rare.
Doctor @femtoba tweeted:

Hepatic pregnancy isn't abysmal but it's very rare...like <1% incidence rate. Mechanism of its occurrence isn't well spelt out but the woman must have had some of its predisposing factors such as previous chronic PID, previous Surgery to the uterus.

He added :

That may have possibly linked the some part of the uterine wall, where the foetus should have normally been implanted, to retroperitoneal pouch that indirectly connects the liver. I can explain this tho but Too much unavoidable technical terms will make it hard to comprehend.

A Google search for Hepatic pregnancy shows that it means "a type of abdominal pregnancy which is extremely rare where the site of implantation is in the liver and it is associated with a very high mortality rate."
Below are twitter reactions to the sonoram and a video of the sonogram.