KISTA HEPAR
I. PENDAHULUAN
Dalam pengertian secara histopatologi, kista adalah rongga yang dilapisi sel epitel. Pada kista terdapat duktus yang terdilatasi yang biasanya disebabkan oleh obstruksi, hiperplasia epitel, sekresi berlebihan dan distorsi struktural. Sebagian kista timbul
dari sisa-sisa epitel ektopik atau sebagai hasil nekrosis di tengah-tengah
massa epitel.
(1)
Kista dapat bersifat kongenital atau didapat. Cairan kista biasanya bening dan tidak berwarna namun dapat juga viskous atau mengandung kristal kolesterol sebagai hasil dari nekrosis jaringan. True cysts atau kista yang sesungguhnya harus dibedakan dari false cysts atau pseudokista, dimana pseudokista ini merupakan timbunan cairan yang terkandung dalam kavitas yang tidak mempunyai lapisan epithelium. Kista seperti ini biasanya berasal dari suatu proses inflamasi atau degeneratif.
(2)
Penyakit kistik hepar sering diidentifikasi saat laparotomi dan selama pemeriksaan gejala abdominal yang tidak berhubungan dengan kista. Dalam banyak kasus, penemuan kista hepar yang tidak terduga baik soliter maupun multipel, tidak memiliki arti klinis bila tidak bergejala, walaupun kista hepar ini juga dapat diasosiasikan sebagai proses patologis yang cukup serius.
(3)
II. ANATOMI HEPAR
Hepar terletak pada kuadran kanan atas abdomen, intraperitoneal tepat di bawah sisi kanan diafragma yang dilindungi oleh costa. Berat hepar kurang lebih 1400 gram pada orang dewasa dan dibungkus oleh sebuah kapsul fibrous.
(4)
1
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Gambar 1. Posisi hepar dalam tubuh
(5)
Hepar memiliki facies diaphragmatica dan facies visceralis (dorsokaudal) yang dibatasi oleh tepi kaudal hepar. Facies diaphragmatica bersifat licin dan berbentuk kubah, sesuai dengan cekungan permukaan kaudal diafragma, tetapi untuk sebagian besar terpisah dari diafragma karena recessus subphrenicus cavitas peritonealis. Hepar tertutup oleh peritoneum, kecuali di sebelah dorsal pada area nuda, tempat hepar bersentuhan langsung pada diafragma. Area nuda hepar ini
dibatasi oleh melipatnya peritoneum dari diafragma ke hepar sebagai lembar ventral (cranial) dan lembar dorsal (kaudal) ligamentum coronarium. Kedua lembar tersebut bertemu di sebelah kanan untuk membentuk ligamentum triangulare. Ke arah kiri lembar-lembar ligamentum coronarium tercerai dan membatasi area nuda hepar yang berbentuk segitiga. Lembar ventral ligamentum di sebelah kiri bersinambungan dengan lembar kanan ligamentum falciforme, dan lembar dorsal bersinambungan dengan lembar kanan omentum minus. Lembar kiri ligamentum falciforme dan
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Hepar terbagi menjadi lobus hepatis dekstra dan lobus hepatis sinistra yang masing-masing berfungsi secara mandiri. Masing-masing lobus memiliki pendarahan sendiri dan arteria hepatica dan vena portae hepatis, dan juga penyaluran darah venosa dan empedu bersifat serupa.
(3,6,7)
Lobus hepatis dekstra dibatasi terhadap lobus hepatis sinistra oleh fossa vesicae biliaris dan sulcus vena cava pada facies visceralis hepatis, dan oleh sebuah garis khayal pada permukaan diaphragmatika yang melintas dari fundus vesicae biliaris ke vena cava inferior.
(6)
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Lobus hepatis sinistra mencakup lobus caudatus dan hampir seluruh lobus quadratus. Lobus hepatis sinistra terpisah dari lobus caudatus dan lobus quadratus oleh fissure ligament teretis dan fissura ligamenti venosi pada facies visceralis, dan oleh perlekatan ligamentum teres hepatis pada facies diaphragmatica.
(6,7)
Hepar menerima darah dari dua sumber: arteri hepatica propria (30%) dan vena porta hepatis (70%). Arteri hepatica propria membawa darah yang kaya akan oksigen dari aorta, dan vena porta hepatis mengantar darah yang miskin akan oksigen dari saluran cerna, kecuali dari bagian distal canalis analis. Di porta hepatis arteri hepatica propria dan vena porta hepatis berakhir dengan membentuk ramus dekstra dan ramus sinistra, masing-masing untuk lobus hepatis dekstra. Lobus-lobus ini berfungsi secara terpisah, dalam masing-masing lobus cabang primer vena porta hepatis dan arteri hepatica propria teratur secara konsisten untuk membatasi segmen vascular. Bidang horizontal melalui masing-masing lobus membagi hepar menjadi delapan segmen vascular. Antara segmen-segmen terdapat vena hepatica untuk menyalurkan darah dari segmen-segmen yang bertetangga.
(3,4,6,7)
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Vena hepatica yang terbentuk melalui persatuan vena centralis hepatis, bermuara dalam vena cava inferior, tepat kaudal dari diaphragm. Hubungan vena ini dengan vena cava inferior membantu memantapkan kedudukan hepar.
(6)
(5)
Gambar 4. Sistem duktuli dan vaskular intrahepatik
Hepar memiliki vasa lymphaticum superficial dan vasa lymphaticum profundum. Vasa lymphaticum superficial terbanyak bergabung dengan pembuluh limfe di porta hepatis dan ditampung oleh nodi lymphoidei hepatici.
(6)
Pembagian anatomi menurut nomenklatur Couinaud sangat penting dalam mempertimbangkan reseksi segmen hepar. Hal ini memungkinkan kita melakukan reseksi pada segmen tertentu atau kombinasi beberapa segmen dengan tetap mempertahankan vaskularisasi dan kontinuitas aliran bilier pada segmen yang tertinggal.
(3)
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(5)
Gambar 5. Segmen fungsional hepar – Couinaud’s nomenclature
Anatomi hepar dapat dideskripsikan menggunakan dua aspek yang berbeda : anatomi morfologis dan anatomi fungsional. Anatomi morfologis tradisional berdasarkan pada penampakan eksternal hepar, dan tidak mempertimbangkan vaskularisasi dan percabangan duktus biliaris, yang sebenarnya penting dalam reseksi hepar.
(8)
Klasifikasi Couinaud C. Couinaud (1957) membagi hepar menjadi delapan segmen fungsional yang
independen. Setiap segmen memiliki aliran vaskular masuk dan keluar masing-
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dari vena porta, arteri hepatis, dan duktus biliaris. Di daerah perifer tiap segmen terdapat aliran darah keluar melalui vena hepatica.
(8)
– Couinaud’s nomenclature Gambar 6. Segmen fungsional hepar – Couinaud’s
(8)
Vena hepatica dekstra membagi lobus kanan menjadi segmen anterior dan posterior. Vena hepatica media membagi hepar menjadi lobus kiri dan kanan (atau hemilever kiri dan kanan). Aliran ini berasal dari vena cava inferior hingga fossa bulibuli. Vena hepatica sinistra membagi lobus kiri menjadi segmen medial dan lateral.
(8)
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Segmentasi Hepar
Gambar 7. Segmentasi hepar secara clockwise
(8)
Terdapat delapan segmen dari hepar. Segmen 4 biasanya dibagi lagi menjadi segmen 4a dan 4b (menurut klasifikasi Bismuth). Penomoran segmen hepar ini diatur searah jarum jam ( clockwise). Segmen 1 (lobus caudatus) terletak posterior, yang tidak tampak dalam proyeksi frontal.
(8)
Couinaud membagi hepar menjadi lobus fungsional kiri dan kanan ( gauche et
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Anatomi Transversal
Gambar 8. Potongan transversal segmen superior hepar
(8)
Gambar di atas menunjukkan potongan transversal segmen superior hepar, yang dipisahkan oleh vena hepatica. Gambar di sebelah kanan menunjukkan potongan transversal setinggi vena porta sinistra. Pada tingkat ini vena porta membagi lobus kiri hepar menjadi segmen superior (2 dan 4a) dan segmen inferior (3 dan 4b). Vena porta sinistra terletak sedikit lebih tinggi daripada vena porta dekstra.
(8)
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Pada gambar di atas, gambar di sebelah kiri adalah potongan setinggi vena porta dekstra. Pada tingkat ini vena porta dekstra membagi lobus kanan hepar menjadi segmen superior (7 dan 8) dan segmen inferior (5 dan 6). Pada potongan setinggi vena lienalis di gambar sebelah kanan, hanya segmen inferior hepar yang terlihat.
(8)
Klasifikasi Bismuth
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portal sectors, sebab masing-masing disuplai oleh pedikel vena porta di bagian
tengahnya. Garis pemisah antarsektor mengandung sebuah vena hepatica. Oleh karena itu klasifikasi ini dapat digambarkan sebagai vena hepatica dan pedikel vena porta yang saling mengisi, seperti halnya jari-jari tangan yang saling ditautkan.
(8)
Vena porta sinistra membagi lobus kiri hepar menjadi dua sektor : anterior dan posterior. Sektor anterior kiri terbagi atas dua segmen : segmen IV yaitu lobus quadratus, dan segmen III, yang merupakan bagian anterior dari lobus hepar kiri. fissura umbilicalis). Kedua segmen ini dipisahkan oleh fissura hepatica sinistra ( fissura
Sektor posterior kiri hanya terdiri atas segmen II, yang berada di bagian posterior dari lobus kiri hepar.
(8)
III. FISIOLOGI HEPAR
Hepar memiliki banyak fungsi, termasuk fungsi pengambilan, penyimpanan, dan distribusi nutrisi dari darah atau traktus gastrointestinal, sintesis, metabolism, dan eliminasi berbagai substrat endogen, eksogen, dan berbagai macam toksin. Hepar menerima suplai darah ganda dengan 75% dari vena porta, dan 25% dari arteri hepatica. Terdapat autoregulasi dari aliran arteri hepatica, namun tidak dari sistem vena porta. Aliran vena porta meningkat seiring dengan asupan makanan, garam empedu, sekretin, pentagastrin, polipeptida intestinal vasoaktif (VIP), glucagon,
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2. Saluran empedu Saluran ini berfungsi untuk mengalirkan material yang disekresikan oleh sel-sel hepar, termasuk bilirubin, kolesterol, dan obat-obat yang telah terdetoksifikasi. Sistem ini berasal dari apparatus Golgi, yang melewati mikrovili dari kanalis biliaris dan berakhir pada common bile duct. 3. Sistem retikouloendotelial Sistem ini memiliki 60% elemen pada hepar, termasuk pula sel Kupffer dan sel-sel endothelial. 4. Sel fungsional hepar (hepatosit) Sel ini memiliki aktifitas yang sangat bervariasi. Fungsi metabolik dari hepar membantu menyediakan kebutuhan tubuh. Sel-sel ini membantu proses anabolik maupun katabolik, fungsi sekresi dan penyimpanan.
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Tes Fungsi Hepar
Beberapa tes biasanya sering dilakukan untuk menganalisa kondisi hepar, disebut sebagai tes fungsi hepar. Serum aspartate aminotransferase (AST) dan alanine aminotransferase (ALT) adalah pengukuran level enzim yang normal
terdapat di dalam hepatosit. Selain itu dapat pula dilakukan pengukuran kadar albumin, faktor pembekuan, dan bilirubin dari sampel darah.
(4,7)
Jenis tes
Nilai normal
Serum albumin
3,5 – 4,6 g/dL
Total protein
6,0 – 7,4 g/dL
Kolesterol
135 – 300 mg/dL
Alkali fosfatase
24 – 100 IU/dL
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Fungsi Normal Hepar Metabolisme energi dan interkonversi substrat
Produksi glukosa melalui glukoneogenesis glukoneogenesis dan glikogenolisis glikogenolisis Konsumsi glukosa melalui jalur sintesis glikogen, sintesis asam lemak, glikolisis, dan siklus asam trikarboksilat Sintesis kolesterol dari asetat, sintesis trigiliserida dari asam lemak, dan sekresi keduanya pada partikel partikel VLDL Pengambilan kolesterol dan trigliserida melalui endositosis partikel HDL dan LDL dengan ekskresi kolesterol pada empedu, beta-oksidasi asam lemak, dan konversi dari asetil-KoA berlebih menjadi keton Deaminasi asam amino dan konversi ammonia menjadi urea melalui siklus urea Transaminasi dan sintesis de novo asam amino non esensial Fungsi sintesis protein
Sintesis berbagai macam protein plasma, termasuk albumin, faktor pembekuan, protein pengikat, apolipoprotein, angiotensinogen, dan insulin-like growth factor I
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IV. EPIDEMIOLOGI
Kista hidatid bersifat endemik di negara-negara berkembang maupun negara maju seperti negara Mediterania, Amerika Selatan, Australia dan New Zealand. Insidens penyakit kista hidatid di kawasan endemik berkisar dari 1-220 kasus per 100. 000 orang penduduk. Tidak terdapat predileksi dari jenis kelamin namun biasanya kista hidatid terjadi pada umur antara 30-40 tahun.
(3,7)
Insidens kista hepar non-parasitik yang pasti tidak diketahui karena biasanya penderita asimptomatik dan tidak menunjukkan gejala hingga terjadi komplikasi. Namun diperkirakan kista hepar diderita oleh 5% dari populasi umum. Tidak lebih dari 10-15% dari jumlah penderita ini mengalami simptom secara klinis. Kista hepar biasanya dijumpai secara tidak sengaja pada pemeriksaan radiologik abdominal atau pada prosedur laporotomi untuk kelainan lain yang dialami penderita, yang tidak berkaitan dengan gangguan fungsi hepar.
(3,10)
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V. KLASIFIKASI KISTA HEPAR
Kista intrahepatik kongenital Parenkimal Soliter Penyakit polikistik hepar Anak Dewasa Fibrosis hepatis kongenital Dilatasi fokal duktus biliaris intrahepatik ( Caroli’s disease ) Kista intrahepatik didapat ( acquired) Inflamatorik Piogenik Amebik Echinococcal (hydatid)
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Penyakit polikistik hepar menunjukkan gambaran honeycomb appearance dengan kavitas yang multipel, dengan lesi yang tersebar merata di seluruh hepar.
(7)
Baik lesi soliter maupun polikistik tumbuh secara perlahan dan relatif tidak bergejala. Sebuah massa di kuadran kanan atas yang tidak nyeri adalah keluhan yang paling sering, dan ketika gejala muncul, biasanya dihubungkan dengan penekanan pada organ yang berdekatan. Nyeri abdominal yang akut dapat mengikuti komplikasi torsi, hemoragik intrakistik, atau rupturintraperitoneal. Pemeriksaan klinis dapat mengidentifikasi massa, dan ginjal juga dapat teraba. Ikterus jarang ditemukan.
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yang mengandung jaringan ikat longgar dan duktus biliaris serta pembuluh darah yang terkompresi.
(3)
Kista soliter dapat berasal dari duktus yang tumbuh abnormal sebagai akibat dari hiperplasia inflamatorik atau obstruksi kongenital. Kista ini dapat mengenai semua usia. 90% dari kista jenis ini unilokular, dan memiliki ukuran yang bervariasi. Sebuah kista yang mengandung 2,5 liter cairan telah dilaporkan pada pasien berusia 2 tahun.
(1)
Penyebab dari kista jenis ini tidak diketahui, namun diduga muncul secara
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mengenai hepar dan ginjal dengan peningkatan absolut dari duktus biliaris intrahepatik.
(12)
Sebuah kelainan genetik yang jarang pada anak, infantile polycystic disease of the kidneys and liver, biasanya fatal pada anak-anak. Kista hepatik yang berukuran
mikroskopik dapat terlihat, anak-anak ini dapat mengalami hipertensi portal, atau hipertensi arteri renalis dan gangguan renal yang progresif.
(1)
Penyakit polikistik hepar pada orang dewasa diwariskan secara dominan autosomal. Hepar tampak kistik difus secara makroskopik, walaupun dapat tampak
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Kista Intrahepatik Acquired (didapat)
Echinococcal/Kista Hydatid
Kista jenis ini dapat ditemukan di seluruh dunia, terutama di daerah peternakan biri-biri. Daerah ini termasuk Mediterania (terutama Yunani), Australia, dan New Zealand, serta negara di Timur Tengah seperti Iran. Infeksi Echinococcal disebabkan oleh Echinococcus granulosa, yang dapat asimptomatis selama bertahuntahun
dan
menunjukkan
hasil
yang
efektif
dengan
pembedahan,
atau E.
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Komplikasi dari kista hidatid di antaranya
(7,12)
:
Ruptur intrabilier, yang mengenai 5% hingga 10% kasus.
Ruptur
intraperitoneal,
yang
sangat
jarang
namun
dapat
pembentukan kista baru pada rongga peritoneal.
Infeksi bakteri sekunde, yang menyebabkan pembentukan abses.
Ekstensi transdiafragmatika ke rongga pleura.
menyebabkan
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CT scan, yang menunjukkan sebuah massa kistik dengan dinding yang tebal bertepi
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mengandung hemosiderin. Kista yang simptomatik harus dieksisi secara utuh apabila
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Pemeriksaan
histologik
dari
kista
dilakukan
dengan
tujuan
untuk
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hipervaskular, sedangkan dinding kista pada simple cyst tipis dan uniform. Simple
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Penanganan Operatif
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