Appendix cancer differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Soroush Seifirad, M.D.[2]

Overview

appendix cancer must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].

OR

appendix cancer must be differentiated from [[differential dx1], [differential dx2], and [differential dx3].

Differentiating appendix cancer from other Diseases

appendix cancer must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].

OR

appendix cancer must be differentiated from [differential dx1], [differential dx2], and [differential dx3].

OR

As appendix cancer manifests in a variety of clinical forms, differentiation must be established in accordance with the particular subtype. [Subtype name 1] must be differentiated from other diseases that cause [clinical feature 1], such as [differential dx1] and [differential dx2]. In contrast, [subtype name 2] must be differentiated from other diseases that cause [clinical feature 2], such as [differential dx3] and [differential dx4].

Differentiating appendix cancer from other diseases on the basis of [symptom 1], [symptom 2], and [symptom 3]

On the basis [symptom 1], [symptom 2], and [symptom 3], appendix cancer must be differentiated from [disease 1], [disease 2], [disease 3], [disease 4], [disease 5], and [disease 6].

Diseases		Clinical manifestations								Para-clinical findings								Gold standard
		Symptoms					Physical examination
										Lab Findings			Imaging				Histopathology
		Abdominal pain	Change in girdle size	Change in bowel habits		Other symptoms	Abdominal mass	abdominal tenderness	Other physical examination findings	Urinary 5-hydroxyindoleacetic acid (5-HIAA)	Serum Chromogranin A (CgA)	Other lab findings	CT scan	MRI	Utrasounography	Other imaging modalities
				Diarrhea	Constipation
Appendix cancer	Adenocarcinoma1	+/-	-/+	-	+	Generally asymptomatic Appendicitis symptoms Nausea & vomiting,decreased appetite Anorexia No gas or stool pass (intestinal obstruction) Bone pain (bone metastasis) Bloating (ascites)	-	-	Ascites Shifting dullness	-	-	CEA CA 19-9	Soft tissue thickening Wall irregularity Presence of pseudomyxoma peritonei Calcification Internal septations Periappendiceal fat stranding and intraperitoneal free fluid which is a nonspecific finding Cystic lesion	Diffusion weighted MRI has been shown to be the modality of choice for peritoneal carcinomatosis Increased fluid signal on T2 weighted sequence Soft tissue mass in the appendix Invasion to other structures	Dilated appendix Periappendiceal fluid collection Distinct appendix wall layers	Positron emission tomography (PET)	Gross pathology: Gray/yellowi color Cystic structures with angiolymphatic invasion Microscopic pathology:	Biopsy
	Carcinoid tumor2	+/-	-	+	-	Generally asymptomatic Flushing Palpitation Dyspnea	-	-	Tricuspid regurgitation murmur Wheezing	+	+	Ki67: a reliable marker of cell proliferation				Somatostatin scintigraphy with 111-indium-octreotide Bone scintigraphy with 99mTc-methylene diphosphonate (99mTcMDP) Positron emission tomography (PET)	Gross pathology: Gray/yellowi color Cystic structures with angiolymphatic invasion Microscopic pathology:	Biopsy
Ovarian cancer		+/-	+/-	-	+/-	Pelvic/abdominal pain or pressure Vaginal bleeding/discharge Dyspnea GI disturbance	+	+/-	Ascites Shifting dullness Fever Pleural effusion	-	-	Depends on the underlying etiology Iron HCG LDH Calcium Estrogen progestron Testosterone AFP CA 125 Ki 67	Adnexal mass Adenexal Cyst (simple or complex) Fluid accumulation Endometrial thickening calcification Pleural effusion Peritoneal involvement Lymphandenopathy	Adnexal mass Adenexal Cyst (simple or complex) Except for Thecoma, ovarian masses are generally hyperintense on T1 and hypo or isointense on T2 imaging Fluid accumulation Endometrial thickening calcification Pleural effusion Peritoneal involvement Lymphandenopathy	Adnexal mass Adenexal Cyst (simple or complex) Fluid accumulation Increased Doppler flow Endometrial thickening calcification	N/A	Depends on the tumor type. You may find the details here.	Biopsy
Pseudomyxoma peritonei		+	+	-/+	-/+	Bloating	-	+	Ascites Shifting dullness	-	-	Non specific Depends on the etiology of the disease	Low-attenuation Scalloping of the visceral surfaces differentiates pseudomyxoma from other causes of peritnoitis. Typically does not invade visceral organs or spread by lymphatic or hematogenous routes unlike mucinous carcinomatosis	Characterized by a mass which is hypointense on T1-weighted MRI and hyperintense on T2-weighted MRI. MRI has better sensitivity in detecting ascites fluid and mucocele.	The echoes within pseudomyxoma peritonei are not mobile. Echogenic septations within the gelatinous ascites. Scalloping of the hepatic and splenic margins	18F-FDG PET scan	Depending on WHOclassification, whether it's low or high grade with cellular atypia or acellular mucin. ( DPAM, PMCA) Gelatinous ascites in peritoneum and visceralorgans,usually underneath the right hemidiaphragm, liver. Omental cake Immunohistochemisty CK 20 CDX2 MUC2 MUC5AC	Diagnostic laparascopy/laparatomy
Carcinoid syndrome		-/+	-	+	-	Flushing Palpitation Dyspnea	-	-	Tricuspid regurgitation murmur Wheezing	+	+	Ki67 N-terminal pro–B-type natriuretic peptide Substance P Neurotensin Bradykinin Human chorionic gonadotropin Neuropeptide L Pancreatic polypeptide	Depends on the primary tumor location and type	Depends on the primary tumor location and type	Depends on the primary tumor location and type	Somatostatin scintigraphy with 111-indium-octreotide Bone scintigraphy with 99mTc-methylene diphosphonate (99mTcMDP) Positron emission tomography (PET) 123I-MIBG scintigraphy Capsule endoscopy (CE) Enteroscopy Angiography MRI Angiography Endoscopic ultrasonography (EUS)
Appendicitis 3		LLQ / RRQ	-	-/+ Intermittent Secretory type	+	Nausea & vomiting,decreased appetite Anorexia	+/-	+	Rebound tenderness Abdominal guarding Rovsing's sign Psoas sign Obturator sign TR exam might reveal tenderness in the rectovesical pouch Tachypnea Tachycardia Hypotension Diaphoresis Pallor	-	-	Leukocytosis Left shift	Appendiceal wall thickening /perforation peri-appendiceal inflammation, fluid accumulation,fat stranding	Increased fluid signal on T2 weighted sequence	Evidences of inflammation Dilated appendix Periappendiceal fluid collection Distinct appendix wall layers	Tc-99m labeled anti-CD15 antibodies	Evidences of inflammation	A combination of Imaging (ultrasonography or CT scan, while CT scan is more sensitive), physical exam and history Alvarado Score

¹ Adenocarcinomas usually present with appendicitis, barely they might present with Pseudomyxoma peritonei; meanwhile Pseudomyxoma peritonei is more prevalent in perforated mucocele, goblet cell tumor or high stages of adenocarcinoma.

² Generally appendix carcinoids are asymptomatic, they were only become symptomatic if they metastasize to the liver, or in rare cases make an obstruction and present with appendicitis which is quit uncommon in appendiceal carcinoids compared to appendiceal adenocarcinoma. Any patient with carcinoid syndrome should be evaluated for appendix carcinoids.

³ Every patient with appendicitis should be evaluated for appendix cancer, 0.5 in 100 appendicitis cases are because of appendix cancer.