A Very Unusual Case of a Dorsal Heteropagus Twin
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1 PRG A Very Unusual Case of a Dorsal Heteropagus Twin Nathan David P. Concepcion, MD 1, Bernard F. Laya, DO 1, Eduardo P. Manrique, MD 2 and Faith Caroline D. Bayabos, MD 1 1 Section of Pediatric Radiology, St. Luke s Medical Center, Philippines 2 Department of Pediatrics, Quirino Memorial Medical Center, Philippines
2 Introduction Conjoined twinning is a rare occurrence Estimated prevalence = 1:40,000 to 2,000,000 Southeast Asia and Africa = 1:14,000 to 25,000 Female : Male ratio = 3:1
3 Nomenclature Diplopagus complete, equal and symmetrical Heteropagus incomplete, unequal and asymmetrical the parasite is smaller and dependent on the host (autosite) parasite is either attached to any portion of the body or even within the host (fetus-in-fetu)
4 Classification according to the most prominent site of union Thoracopagus most common; anterior thoracic conjunction Rachipagus only 2% most common site is at the midportion of the posterior vertebral column above the sacrum
5 Conjoined Twinning thoracopagus rachipagus lumbar rachipagus DIPLOPAGUS HETEROPAGUS Kingston, CA, et al. Radiographics.2001;21: Spencer, R. Teratology.1995;52:
6 Case Report 3 year-old male born with a dorsal mass otherwise asymptomatic Figure 1. Our patient.
7 Dorsal Mass Consists of: immobile lower limb in permanent flexion due to soft tissue fusion supernumerary toes buttocks anus-like orifice phallic structure above the foot A B Figure 2. Our patient with the parasitic rachipagus in lateral (A) and posterior (B) views.
8 Magnetic Resonance Imaging AUTOSITE syrinx at T5 to T8 spinal cord tethering below T8 PARASITE large predominantly fatty mass from T5 to L5 no musculature along the bones blind-ending external orifice in the parasite phallic structure shows no urethra or adjacent testes indiscernible soft tissue and cystic components
9 Figure 3. T1W (A) and T2W (B) sagittal MR images showing the syrinx and cord tethering. T5 L5 A B
10 Computed Tomography AUTOSITE spina bifida at T6 down to the sacral bones butterfly vertebrae at T11, L1 and hemivertebra at T12 causing levoscoliosis thoracic and abdominal cavities are grossly unremarkable PARASITE malformed vertebrae, pelvic bones, femur, tibia, fibula and supernumerary digits are noted
11 Figure 4. Radiograph, coronal and 3D reconstructions of the bones.
12 CT Angiography Blood supply is from a spinal branch of a right intercostal artery from the descending thoracic aorta at the level of T10 vertebral body No discrete draining veins
13 Figure 5. Axial post-contrast CT images and 3D reconstruction of the blood supply.
14 During surgery
15 Histopathology Mature elements from skin, bone, cartilage, muscle, fat, brain, respiratory and cervical epithelium were obtained. The phallic structure contained several cysts of epidermal origin all lined by skin epithelium (see below).
16 Discussion Most heteropagus twins are either joined ventrally above the umbilicus (epigastric heteropagus) or dorsally in the vertebral column (rachipagus) 28 rachipagus (dorsal heteropagus) twins have been reported Only 2 are diplopagus, the rest are heteropagus 18 females, 5 males, 5 not reported 24 (86%) has thoracic and/or lumbar connection 9 had meningocele
17 Discussion accurate imaging to define anatomic fusion, vascular and other anomalies and for surgical planning CT and MR of the spine are needed for rachipagus type assessment of the cardiovascular system is recommended in all types no overall mortality or morbidity reported outcome better without shared vital organs prognosis depends on type and extent of union
18 Conclusion Hence, this is a very unusual case of an otherwise asymptomatic boy with a parasitic rachipagus where CT and MRI played a crucial role in the diagnosis, assessment of other anomalies, and for surgical planning and prognostication.
19 References Chadha R, et al. Lumbosacral parasitic rachipagus twin. J Pediatr Surg 2006; 41(1): e45-e48. Ratan SK, et al. Thoracolumbar rachipagus parasite. Pediatr Surg Int 2004; 20(4): Spitz L and EM Kiely. Conjoined Twins. JAMA 2003; 289(10): Kingston CA, et al. Imaging in the Preoperative Assessment of Conjoined Twins. Radiographics 2001; 21: Spencer R, et al. Anencephaly, dorsal hypermelia and duplication of the vertebral column: a rare type of rachipagus conjoined twins. Teratology 1996; 53(4): Spencer R. Rachipagus conjoined twins: they really do occur! Teratology 1995; 52(6):
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