Comment on

• Diagnosis of station and rotation of the fetal head in the second stage of labor with intrapartum translabial ultrasound.

  Ghi T, Farina A, Pedrazzi A, Rizzo N, Pelusi G, Pilu G. Ghi T, et al. Ultrasound Obstet Gynecol. 2009 Mar;33(3):331-6. doi: 10.1002/uog.6313. Ultrasound Obstet Gynecol. 2009. PMID: 19202576
• Transperineal ultrasound imaging in prolonged second stage of labor with occipitoanterior presenting fetuses: how well does the 'angle of progression' predict the mode of delivery?

  Kalache KD, Dückelmann AM, Michaelis SA, Lange J, Cichon G, Dudenhausen JW. Kalache KD, et al. Ultrasound Obstet Gynecol. 2009 Mar;33(3):326-30. doi: 10.1002/uog.6294. Ultrasound Obstet Gynecol. 2009. PMID: 19224527
• Sonographic evaluation in the second stage of labor to improve the assessment of labor progress and its outcome.

  Yeo L, Romero R. Yeo L, et al. Ultrasound Obstet Gynecol. 2009 Mar;33(3):253-8. doi: 10.1002/uog.6336. Ultrasound Obstet Gynecol. 2009. PMID: 19247999 Free PMC article. No abstract available.
• A new method to assess fetal head descent in labor with transperineal ultrasound.

  Barbera AF, Pombar X, Perugino G, Lezotte DC, Hobbins JC. Barbera AF, et al. Ultrasound Obstet Gynecol. 2009 Mar;33(3):313-9. doi: 10.1002/uog.6329. Ultrasound Obstet Gynecol. 2009. PMID: 19248000