Monochorionic Twins

Monochorionic, diamniotic twins T sign (Courtesy of Dr. Seaward and Dr. Ryan, Mt Sinai Hospital)

Dichorionic Twins

Dichorionic, diamniotic twins lamdba sign (Courtesy of Dr. Seaward and Dr. Ryan, Mt Sinai Hospital)

Placenta Previa

Placenta (P) covers the os. Crosses (+) approximate the cervical length and the bladder (B) is seen on the right. (Courtesy of Dr. Seaward and Dr. Ryan, Mt Sinai Hospital)