Symmetrical, extracellular fibrils, which are related to the "special fibrils" of the dermis described by Palade and Farquhar, have been found along the outer surface of the basement membrane covering the notochord in the tail of Rana catesbeiana (bullfrog) tadpoles. The fibrils are approximately 7,500 A long and occur singly or in clusters. The single fibrils are characterized by a symmetrical...

We give three proofs for the following symmetrical identity involving binomial coefficients ( n m ) and Eulerian numbers 〈 n m 〉 : ∑ k ( a + b k ) 〈 k a − 1 〉 = ∑ k ( a + b k ) 〈 k b − 1 〉 for any positive integers a and b (where we take 〈 0 0 〉 = 0). We also show how this fits into a family of similar (but more complicated) identities for Eulerian numbers.

A 27-year-old woman presented to the clinic with well-demarcated symmetrical dry gangrene of all the toes. The onset was insidious during recent hospitalization for urosepsis and shock. There is no antecedent history of peripheral ischemia, use of oral contraceptive pill, or smoking. Her medical history is significant for hypertension and preeclampsia. Dorsalis pedis and posterior tibial pulses...

Chronic recurrent multifocal osteomyelitis is often confused with symmetrical Brodie's abscess as it has a similar pathogenesis. We report an otherwise healthy 17-year-old boy presenting with a true symmetrical Brodie's abscess. We conclude that a symmetrical Brodie's abscess presenting in an otherwise healthy patient is a separate clinical condition with a different management protocol.

Ocular movements, cover test, and visual fields to confrontation were all normal. Pupils were equal and active, but showed some corectopia upwards and nasally. The left eye was markedly hypermetropic, but disc and macula were both normal, and examination of the rest of the fundus at this stage revealed no abnormality which might account for the poor visual acuity. The right cornea had an extens...