KEY FACTS Imaging • Classic findings of tubal ectopic pregnancy (EP) ○ No intrauterine pregnancy (IUP) ○ Tubal mass ○ Echogenic fluid in cul-de-sac (peritoneal blood) • Nonspecific adnexal mass…

KEY FACTS Terminology • Mature cystic teratoma (MCT) = dermoid cyst • Immature teratoma • Monodermal teratoma in which 1 cell line predominates Imaging • MCTs have variety of appearances…

KEY FACTS Top Differential Diagnoses • Agenesis of corpus callosum (ACC) ○ Axial: Teardrop-shaped ventricles (colpocephaly) ○ Coronal: Texas Longhorn frontal horns ○ Sagittal: Loss of anterior cerebral artery branch…

KEY FACTS Terminology • Endometriosis: Ectopic endometrial glands outside of uterine cavity • Endometrioma: Cystic collection of mixed blood products Imaging • Diffuse low-level internal echoes in 95% ○ Homogeneous…

KEY FACTS Terminology • Well-defined histology: Papillary and follicular carcinoma Imaging • Papillary carcinoma (~ 80% of thyroid cancer) ○ Majority are ill-defined with irregular outlines ○ 10-20% multifocal, 70%…

KEY FACTS Terminology • Viable pregnancy defined as one with potential for live birth • Nonviable pregnancy is one that will not result in live birth • Probable intrauterine pregnancy…

KEY FACTS Imaging • Pleomorphic adenoma ○ Most common parotid space tumor (80%) ○ Well defined, lobulated, solid, hypoechoic ○ Homogeneous internal echoes with posterior enhancement ○ Large tumors more…

KEY FACTS Terminology • Adnexal torsion is more accurate term than ovarian torsion, as torsion usually also includes fallopian tube Imaging • Ovary > 4 cm long or > 20…

KEY FACTS Terminology • Open spina bifida (bone and skin defect ± sac) ○ Meningomyelocele: Sac + neural elements ○ Meningocele: Sac with fluid only ○ Myeloschisis: No sac (cord…

KEY FACTS Imaging • Soft tissue mass in cervix: Hypoechoic or isoechoic ± necrosis • Hydro- or hematometra from cervical obstruction • Mass extending into upper vagina • MR is…