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Although endometriosis is a common gynecological condition in women of reproductive age, a complication of endometriosis is rarely considered as the differential diagnosis of acute abdominal pain in that context. However, acute events in women with endometriosis can represent life-threatening conditions, which require emergent treatment and often surgical management. Mass effect of endometriotic implants can give rise to obstructive complications, specifically occurring in the bowel or in the urinary tract, while inflammatory mediators released by ectopic endometrial tissue can lead to inflammation of the surrounding tissues or to superinfection of the endometriotic implants. Magnetic resonance imaging is the best imaging modality to reach the diagnosis of endometriosis, but an accurate diagnosis is possible on computed tomography, especially in the presence of stellar, mildly enhanced, infiltrative lesions in suggestive areas. The aim of this pictorial review is to provide an image-based overview of key findings for the diagnosis of acute abdominal complications of endometriosis.

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OBJECTIVE: Compare different imaging scenarios in the diagnosis of uncomplicated renal colic due to urolithiasis (URCU). MATERIALS AND METHODS: A total of 206 prospectively included patients had been admitted with suspected URCU and had undergone abdominal plain film (APF), US and unenhanced CT after clinical STONE score evaluation. CT was the reference standard. We assessed sensitivity (Se), specificity (Spe) and Youden index for colic pain diagnosis, percentage of patients managed by urologic treatment with stone identified, percentage of alternative diagnoses (AD) and exposure to radiation, according to single imaging approaches, strategies driven by patient characteristics and conditional imaging strategies after APF and US. RESULTS: One hundred (48.5%) patients had a final diagnosis of URCU and 19 underwent urologic treatment. The conditional strategy, i.e. CT in patients who had no stone identified at US, had a perfect sensitivity and specificity. This enabled diagnosis of all stones requiring urology management while decreasing the number of CT exams by 22%. The strategy whereby CT was used when there was neither direct or indirect APF + US finding of colic pain nor alternative diagnoses in patients with a STONE score ≥ 10 had a sensitivity of 0.95 and a specificity of 0.99, identified 84% of stones managed by urologic treatment and decreased the number of CT examinations by 76%. CONCLUSION: In patients with clinical findings consistent with URCU, the use of ultrasound as first-line imaging modality, with CT restricted to patients with negative US and a STONE score ≥ 10, led to a sensitivity and specificity of above 95%, identified 84% of stones requiring urological management and reduced the number of CT scans needed by fourfold. KEY POINTS: • For diagnosis, the use of APF + US as first-line imaging, with CT restricted to patients with both a normal APF + US and a STONE score ≥ 10, provides both a sensitivity and specificity superior or equal to 95% and reduces the number of CT scans necessary by fourfold. • For management, the use of APF + US as first-line imaging, with CT restricted to patients with both a normal APF + US and a STONE score ≥ 10, maintains a 84% stone identification rate in urology-treated patients.

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Large bowel obstruction (LBO) is associated with high morbidity and mortality due to delayed diagnosis and/or treatment. MDCT has become the standard of care to identify the site, severity, and etiology of obstruction. The goal of this review is fourfold. The first objective is to give clues to differentiate LBO from colonic pseudo-obstruction. The second objective is to describe CT features in the most common cause of LBO which is colonic cancer by illustrating classical and atypical features of colonic cancer responsible for LBO and by giving the features which must be reported when differentiating malignant from benign: presence of local lymph nodes, other colic localizations, length of involved segment, presence of diverticula, or other. The third objective is to illustrate the various causes of LBO which can mimic a colon cancer by leading to a thickening of the colonic wall: diverticulitis, ischemic colitis, endometriosis, inflammatory disease and to give tips which permit to evoke another diagnosis than a colon cancer in patient with a LBO and a thickening of the colic wall. The fourth objective is to describe the common signs of cecal and sigmoid volvulus and to give tips for a diagnosis sometimes difficult particularly for cecal volvulus: one of two transition points according to the type of volvulus and the presence of a whirl sign with a torsion of the mesenteric vessels.

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PURPOSE: To determine which CT findings or combinations of CT findings could accurately identify adnexal torsion in a cohort of women admitted for abdominal pain and presenting with an adnexal mass. MATERIALS AND METHODS: The local institutional review board approved this retrospective case-control study involving adults-the informed consent requirement was waived. Enhanced computed tomography (CT) findings of 32 consecutive adnexal torsion and 32 control patients admitted for abdominal pain and presenting with an adnexal mass were independently reviewed by two radiologists, with consensus by a third one, for all CT findings commonly assessed in adnexal torsion. All twisted and untwisted adnexa were confirmed by surgery. Univariate and multivariate analyses were performed for adnexal torsion prediction. RESULTS: The median patient age was 41 years (interquartile range, 30.5-62 years). Only benign masses were encountered in the torsion group. Five CT features were significantly associated with adnexal torsion: a large ovary with a threshold at 80mm (p=0.005), median or contralateral displacement of the adnexa (p=0.00014), asymmetric wall thickening of the mass (p<0.0001), inter-utero-ovarian mass (p<0.0001) and whirlpool sign (p=0.0006). In the multivariate analysis, only the inter-utero-ovarian mass was independently associated with adnexal torsion (odds ratio=130 (CI95%: 15-infinite), p<0.0001) with an excellent overall diagnostic performance (AUC=0.89; CI95%: 0.81-0.97). It was a sensitive (Se=97%, CI95%: 84-100) and specific feature (Sp=81%, CI95%: 64-93). CONCLUSION: An inter-utero-ovarian mass is an accurate and reliable CT finding for diagnosing adnexal torsion in patients with acute abdominal pain and an adnexal mass.

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Purpose To assess the rate of underestimation of atypical ductal hyperplasia (ADH) and ductal carcinoma in situ (DCIS) at magnetic resonance (MR) imaging-guided vacuum-assisted breast biopsy and to explore the imaging, demographic, and histologic characteristics associated with lesion upgrade after surgery. Materials and Methods This retrospective study had institutional review board approval, and the need to obtain informed patient consent was waived. A total of 1509 MR imaging-guided vacuum-assisted biopsy procedures were performed in nine centers. A diagnosis of ADH was obtained after biopsy in 72 cases, and a diagnosis of DCIS was obtained in 118 cases. Pearson χ2 and Fisher tests were used to assess the association between demographic, MR imaging, and biopsy features and lesion upgrade. Univariate statistical analyses were performed, and each significant parameter was entered into a multivariate logistic regression analysis. Results Surgical excision was performed in 66 of the 72 ADH cases and in 117 of 118 DCIS cases. The ADH and DCIS underestimation rates were 25.8% (17 of 66) and 23.1% (27 of 117), respectively. Underestimation was 5.6-fold (odds ratio [OR] = 5.6; 95% confidence interval [CI]: 1.7, 18.3) and 3.6-fold (OR = 3.6; 95% CI: 1.2, 10) more likely in mass (n = 20 for ADH and n = 20 for DCIS) than in non-mass (n = 46 for ADH and n = 97 for DCIS), compared with nonunderestimation, in ADH and DCIS respectively. At multivariate analysis, the use of a 9- or 10-gauge needle versus a 7- or 8-gauge needle was also an independently associated with underestimation when a diagnosis of ADH was made at MR imaging-guided biopsy. No other parameters were associated with of ADH or DCIS upgrade at surgery. Conclusion The rates of underestimation in ADH and DCIS diagnosed at MR imaging-guided vacuum-assisted biopsy were high, at around 25%, and were significantly associated with the presence of a mass at MR imaging. © RSNA, 2016.

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