Self-Limited Accumulation of Colloids in Porous Media.

We present local direct imaging of the progressive adsorption of colloidal particles inside a 3D model porous medium. By varying the interparticle electrostatic interactions, we observe a large range of particle deposition regimes, from a single layer of particles at the surface of the medium to multiple layers and eventually clogging of the system. We derive the complete deposition dynamics and show that colloid accumulation is a self-limited mechanism towards a deposited fraction associated with a balance between the particle interactions and the imposed flow rate. These trends are explained and predicted using a simple probability model considering the particle adsorption energy and the variation of the drag energy with evolving porosity. This constitutes a direct validation of speculated particle transport mechanisms, and a further understanding of accumulation mechanisms.

Surgical management of a transverse vaginal septum: About a rare case.

INTRODUCTION: The transverse vaginal septum is a rare anomaly of the müllerian ducts whose pathophysiology is linked to a defect in the resorption of the embryological tissue located between the vaginal dome and the caudal terminal part of the fused müllerian ducts. CASE PRESENTATION: We report a rare case of a permeable transverse vaginal septum in a 41-year-old patient, who consulted for cyclic pelvic pain. DISCUSSION: The vaginal septum is a rare anomaly of the Müllerian ducts whose approximate frequency is around 1/70,000 women. The vaginal septum can be permeable or impermeable and can affect all levels of the vagina. The combination of conventional ultrasound and MRI confirms the diagnosis of these abnormalities. The treatment is surgical and must be implemented quickly. Several surgical techniques have been described, the simplest of which is the "crevice" technique. CONCLUSION: The combination of conventional ultrasound and MRI is useful in confirming the diagnosis of these abnormalities. Surgical treatment should always be well planned. The risks of postoperative stenosis and the impact on the upper genital tract must be taken into account.

Tuberculosis of the breast neoplastic-like about two report cases: A rare often unrecognized diagnosis.

Tuberculosis of the breast is a very rare infection; it occurs chiefly in women of childbearing potential, usually as an apparently primary infection and constitutes a diagnosis and therapeutic challenge. Administration of antituberculous agents is the mainstay of therapy. Surgery is required in some cases. We report tow cases of breast tuberculosis. The diagnosis has been established on histology. Outcome was favorable under anti bacillary treatment. Through the literature data we recall the epidemiological, clinical, diagnostic and treatment of this pathology.