[A case of benign cutaneous polyarteritis nodosa]. / Poliarteritis nodosa cutánea benigna en un caso.

Cutaneous polyarteritis nodosa is a benign form of the disease with cutaneous involvement and occasional systemic manifestations. We report a 51 years old man presenting with malaise, arthralgia, myalgia and nodular, erythematous and painful skin lesions in both legs. The pathological study of these lesions showed a polyarteritis. During hospital stay there was a mild remission of the disease without treatment, but its reappearance during follow lead to the use of prednisone.

Exuberant keloidal formation.

Keloids are disfiguring deformities that occur after trauma or wounding of the skin, most commonly among blacks. The case presented here is unusual because of the number of keloids and the massive size of one. The patient underwent full surgical excision together with intraoperative and postoperative steroid injections with good cosmetic results. Various causes of keloids are reviewed as are the histopathologic differences between hypertrophic scars and keloids. Alternative surgical and nonsurgical treatment techniques are examined.

Responses of growth, photosynthesis, and leaf conductance to white light irradiance and end-of-day red and far-red pulses in Fuchsia magellanica Lam.

The response of Fuchsia magellanica Lam. - a shade-tolerant perennial - to white light photon flux density and end-of-day red and far-red light irradiation was studied to evaluate the role that different morphological and functional alterations play in whole-plant acclimation to shade. The estimated relative growth rate of plants growing under a photon flux density of 30µmol m2 s1 was 71 % of that of those growing under 450µmol m-2 s-1 . The proportion of total dry weight allocated to shoots was higher in low light plants, but the proportion of shoot dry weight allocated to leaf blades was not affected by any of the treatments. The estimated relative growth rate, specific leaf area and leaf conductance were not affected by end-of-day irradiation. In low light plants the specific leaf area was higher, and at saturating photon flux density photosynthesis was lower on a leaf area basis, but was not on a leaf dry weight basis. Dark respiration was higher in high light plants when expressed on an area basis, but not when expressed on a dry weight basis. During the normal photoperiod, leaf conductance measured in darkness was higher in high light plants than in low light ones, which is consistent with the higher stomatal density observed in these plants. The cross-sectional area of the petioles was slightly reduced in low light in spite of a large increase in the area of individual leaves. Low irradiance affected the display of leaves, decreased leaf thickness and increased chlorophyll content per unit dry weight. End-of-day far-red resulted in plants with more erect branches. Both low photon flux density and far-red enhanced internode elongation. The effect of end-of-day irradiations was bigger in low light than in high light, which is the opposite to what is observed in shade-avoiders. The relatively small difference in mean growth rate can be explained by changes in specific leaf area, shoot: root dry weight partition ratio, and by the shape of the photosynthetic light response curve. However when comparing photosynthetic rates on a dry weight basis low light plants do not seem to be at a disadvantage under high light.

Litiasis biliar en niños: reporte de un caso clínico / Biliary lithiasis in children: report of the case clinic

Del estudio de 256 traumatismos maxilo faciales, se concluye que estos traumatismos son más frecuentes en el sexo masculino (75%), en edades que fluctuan entre 21-30 años (51%) y en personas procedentes de zonas urbanas (80%). De este total 23 casos (9%) tuvieron repercusión directa sobre la órbita y su componente. El autor utiliza como tratamiento la reducción cruenta y osteosítesis con alambre quirúrgico, complementando con antrotomía maxilar y uso de balón antral o taponamiento del seno, según se trate de fractura simple o conminuta. En algunos casos deberá recurrir al uso de injertos naturales (hueso-cartílago) cuando la destrucción del piso de la órbita es grande y existe la posibilidad de que el globo caiga en el interior del seno maxilar

Necrotizing sialometaplasia masquerading as residual cancer of the lip.

Necrotizing sialometaplasia is a benign disorder that histologically can mimic carcinoma. It is thought to develop as a result of ischemia or adjacent tissue injury. A patient is described who underwent a Mohs' micrographical fresh-tissue excision of one-third of the upper lip for basal cell carcinoma. By the time she was ready for reconstruction, a marked eczematous reaction developed to a polymyxin neomycin preparation (Neosporin ointment) at the wound edges. Reexcision of the wound margins before a flap reconstruction revealed necrotizing sialometaplasia on histopathological examination. This incidental finding fortunately was not mistaken for residual tumor. To prevent over-diagnosis and over-treatment of presumed malignancies, an awareness of necrotizing sialometaplasia is essential for all surgeons operating on mucosal surfaces in the head and neck.