A rare case of ivory osteoma of mastoid bone

<p>Osteomas are benign slow-growing bony tumour predominantly occurring in long bones, rarely found in the skull. In the skull they are found most commonly in fronto-ethmoid region. They are very rarely found in the temporal bone. They are usually asymptomatic and treated mainly for cosmetic purposes. We describe a case of a 33 years old female presented to us with right sided mastoid swelling from last 6 years.</p>

The Ponticulus Ethmoidalis: A Newly Appreciated Anatomic Landmark in Endoscopic Sinus Surgery

Introduction: Ethmoid sinus anatomy is so variable it has been referred to as a “labyrinth.” Accordingly, this provides a challenge for surgeons performing ethmoidectomy. Identifying consistent anatomic features or landmarks within the ethmoid sinus can aid surgeons performing sinus surgery. The goal of this investigation was to determine if subtle anatomic features are consistently present within the retrobullar recess and could potentially serve as a reliable landmark for surgeons performing ethmoid surgery. Materials and Methods: Ethmoid sinus anatomy was studied in 60 sinonasal complexes through several methods including gross anatomic dissection, endoscopic dissection and 3-D CT stereoscopic imaging. Results: Review of gross sagittal sinonasal specimens revealed that the retrobullar recess was present in all specimens and a tissue bridge was noted emanating from the basal lamella deep within the retrobullar recess in 23/24 gross sagittal specimens; in 1/24 specimens it was quite small or difficult to appreciate. In the radiographic analysis, the tissue bridge was noted in 17/18, in 1/18 it was not appreciated. In the endoscopic dissections it was noted in 17/18, in 1/18 it was small or not appreciated. Conclusion: The small tissue bridge, or ponticulus within the retrobulbar recess was seen in nearly all ethmoid sinuses studied leading us to venture that could be used in surgery to orient surgical dissection through the basal lamella into the posterior ethmoid region.

Schistura albirostris, a new nemacheiline loach (Teleostei: Balitoridae) from the Irrawaddy River drainage of Yunnan Province, China

Schistura albirostris, a new species of nemacheiline loach, is described from the Longchuanjiang, a tributary of theIrrawaddy River of Tengchong County, southwestern Yunnan, China. It differs from all congeners in the combination ofan extremely slender body; a distinctive rectangular unpigmented area on the snout, ethmoid region and anterior rostralbarbels; 5–7 dark dorsal saddles that are confluent with 5–8 lateral bars; lacking a suborbital flap in males; and possessing an incomplete lateral line with 27–51 pores, and a weakly-developed processus dentiformis.

Three new species of Psilorhynchus from the Ayeyarwaddy River drainage, Myanmar (Teleostei: Psilorhynchidae)

Psilorhynchus brachyrhynchus, new species, from the upper Ayeyarwaddy River drainage, northern Myanmar, is distinguished based on a combination of characters, including a short snout (43–48% HL), scale-less ventral surface between paired fins, and features of dorsal and caudal-fin pigmentation. Psilorhynchus piperatus, new species, from the eastern slopes of the Rakhine Yoma mountain range, lower Ayeyarwaddy River drainage, Myanmar, is distinguished based on its unique caudal-fin pigmentation. Psilorhynchus gokkyi, new species, also from the eastern slopes of the Rakhine Yoma mountain range, lower Ayeyarwaddy River drainage, Myanmar, is distinguished based on unique shape of its snout, which exhibits a deep notch at the level of the ethmoid region.