May 12, 2023 · The T sign is really the absence of a twin peak sign (or lambda (λ) sign) and is used in ultrasound assessment of a multifetal pregnancy. It refers to the lack of chorion extending between the layers of the intertwin membrane, denoting a monochorionic pregnancy.

May 8, 2023 · The twin peak sign, also known as the lambda (λ) sign, is the triangular appearance of the chorion insinuating between the layers of the intertwin membrane and strongly suggests a dichorionic diamniotic twin pregnancy. It is best seen in …

Aug 3, 2022 · Radiographic features Ultrasound Sonographic assessment of chorionicity is most accurate in the first trimester. First trimester Features supporting a DCDA pregnancy: presence of two gestational sacs with a thick echogenic chorion surrounding each embryo a thick inter-twin membrane (often taken as >2 mm) twin peak sign (lambda (λ) sign)

Aug 2, 2022 · T-sign of the intertwin membrane Second and third trimesters Findings noted on a second-trimester scan include: the number of placental masses, thickness of the membrane, …

May 12, 2023 · The T sign is seen on a coronal T2 or fat-saturated intermediate-weighted MRI of the elbow. It refers to the interposition of joint fluid between the ulnar insertion of the ulnar collateral ligament and the sublime tubercle and indicates a partial undersurface tear of the distal anterior bundle of the ulnar collateral ligament 1,2.

Jul 10, 2019 · The upper T sign is one of the features useful in identifying the central sulcus of the cerebral cortex on cross-sectional imaging. It relies on identifying the superior frontal sulcus which intersects the precentral sulcus in a "T" junction, thus defining the precentral gyrus.

Aug 17, 2022 · T sign: thin intertwin membrane single placental mass (note, however, that most dichorionic pregnancies have placental masses that abut each other and can be often mistaken for single placenta, especially in the third trimester)

May 12, 2023 · The T sign has been described in several different pathologies: T sign (obstetrics) T sign (elbow MRI) upper T sign (brain) lower T sign (brain) See also tau sign

Aug 3, 2022 · Depending on the chorionicity and amnionicity, the membrane may have a number of layers dichorionic diamniotic (DCDA) pregnancy composed of two chorionic and two amniotic layers usually has a thick (often taken as >2 mm 4) inter-twin membrane more reflective may demonstrate the twin-peak sign at its margin monochorionic diamniotic (MCDA) pregnancy

Jan 11, 2020 · The thoracic spine sign, or spine sign, on lung ultrasound is an indirect indicator of the presence of a pleural effusion or hemothorax. It represents the visualization of the vertebral bodies in the thoracic cavity above the diaphragm which …