By Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)
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Additional info for Abdominal and Pelvic MRI
On unimportant and additional information, if needed, MR images, macro regenerative nodules may appear can be obtained by ultrasonography. as low signal intensity nodules on T2-weighted images. 7 ponsible for this imaging appearance (ITAI et al. Mesenchymal Tumors and 1987; MATSUI et al. 1989). , parasitic), or traumatic. In this section only developmental cysts will be reviewed. Hepatic cysts are usually unilocular and can be solitary or multiple. The cyst wall is 1 mm or less in thickness and usually lined by a simple layer of cuboidal epithelium or, less commonly, squamous or columnar epithelium.
Rummeny In most cases isointensity is noted on only one of the two (Tl- or T2-weighted) pulse sequences. In some cases FNH may mimic other solid liver tumors by being hypointense on Tl-weighted images and hyperintense on T2-weighted images. Even hepatic scars are not specific to FNH and have been observed in a variety of benign and malignant liver tumors (RUMMENY et al. 1989a). For the aforementioned reasons, differentiation of FNH from other malignant or benign solid liver tumors is frequently not possible with plain MRI.
References Ameriks JA, Thompson NW, Frey CF, Appelman HD, Walter JF (1975) Hepatic adenomas, spontaneous liver rupture, and oral contraceptives. Arch Surg 110:548-557 Baum JK, Holtz F, Bookstein JJ, Klein EW (1973) Possible association between benign hepatomas and oral contraceptives. Lancet 11:926-929 Beers BV, Demeure R, Pringot J, et al. (1990) Dynamic spinecho imaging with Gd-DTPA: value in the differentiation of hepatic tumors. AJR 154:515-519 Bree RL, Schwab RE, Neiman HL (1983) Solitary echogenic spot in the liver: is it diagnostic of a hemangioma?
Abdominal and Pelvic MRI by Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)