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 benign appendix lesions (mucocele, acute appendicitis), colorectal cancers, adenexal masses (ovarian tumors), and carcinoid tumors of the other organs.

Differentiating appendix cancer from other Diseases

• Appendix cancer must be differentiated from benign appendix lesions (mucocele, acute appendicitis), colorectal cancers, adenexal masses (ovarian tumors), and carcinoid tumors of the other organs.
• As appendix cancer manifests in a variety of clinical forms, differentiation must be established in accordance with the particular subtype.

• Carcinoid tumors must be differentiated from other diseases that causecarcinoid syndrome, such as palpitation, facial flushing, diarrhea, .
• In contrast, adenocarcinomas and cystadenocarcinomas must be differentiated from other diseases that cause acute appendicitis or present with pseudomyxoma peritonei, such as colorectal cancers, appendix mucoceles.

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) and/or Serum Chromogranin A (CgA)	Other lab findings	CT scan	MRI	Utrasounography	Other diagnostic studies and imaging modalities
Appendix cancer	Adenocarcinoma1	+/-	-/+	Constipation	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/yellow color Cystic structures with angiolymphatic invasion Appendix might be buried within the mass Microscopic pathology: Intestinal, mucinous or signet ring cell types Coexisting acute appendicitis is common IHC might be positive for the following stains: MUC 2 MUC5AC CK 8/18 CK 13 CK 19 CK 20	Biopsy
	Carcinoid tumor2	+/-	-	Diarrhea	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: Prevalent at the tip of appendix Generally less than 1 cm Gray or yellow Well-demarcated firm Intramural nodules that may narrow or obliterate appendiceal lumen Proximal tumors may cause obstruction and appendicitis Microscopic pathology: Insular growth pattern of solid islands of uniform polygonal cells with minimal pleomorphism Retraction of peripheral tumor cells from stroma Angiolymphatic invasion is common Granular eosinophilic cytoplasm with either diffusely scattered or peripherally clumped granules Two types of well differentiated tumors: EC cell (serotonin producing) and rarely L-cell (enteroglucagon or peptide YY producing) IHC might be positive for S100	Biopsy
	Goblet cell carcinoid	+	+/-	+	Generally asymptomatic 60% present with acute appendicitis symptoms Nausea & vomiting,decreased appetite (anorexia)	+/-	+	Ascites Shifting dullness May appear anemic	+/-	CK 20 CK 7 Synapthosin pancreatic polypeptide CEA CA 19-9 CA 125	Unfortunately, compared to the other carcinoid tumors of appendix, GCC is more aggressive and patients with GCC generally present at higher stages. Hence, in addition to the above mentioned general findings for appendix cancers, imaging studies should look for evidences of peritoneal involvement, bone metastasis, lymphadenopathy, and metastatic lesions in ovaries and/or prostate.				Gross pathology: No gross tumor might be present Thickened appendiceal wall Microscopic appearance: GCC Generally spares mucosa and infiltrates muscularis propria and periappendiceal fat Tumor cell clusters Crypt-like structures Tubules of mucus-secreting cells distended with mucin resembling goblet cells Eosinophilic cytoplasm resembling carcinoid tumors Pools of extracellular mucin Scattered Paneth cells in tumors with crypt like structures Extensive perineural invasion Carcinomatous growth pattern: Cribriform growth pattern, solid sheets of infiltrating signet ring cells Nuclear pleomorphism Increased mitotic activity	Biopsy
Appendix Mucocele	Mucosal hyperlasia	-	-	-	Generally asymptomatic Benign even after rupture	-	+/-	N/A	-	N/A	low attenuation well defined mass in RLQ near cecum Inflammation is the key to distinguish between appendicitis and mucocele Wall thickness does not distinguish between malignant and benign mucocele Intramural nodule is a sign of neoplastic lesions Imaging is not a reliable method to distinguish between neoplastic and nonneoplastic lesions, hence every patient should undergo surgery, appendectomy and histopathologic evaluation of the lesion	|Rounded right iliac fossa mass T1: the signal depends on the mucin concentration, may be from hypointense to isointense T2: hyperintense	Histologically benign Dilated fluid filled appendix in the right lower quadrant. Thin appendiceal wall A focus of hyperechogenicity Since generally there is no inflammation Surrounding fat is normal. No peri-appendiceal fluid or collection	N/A	Similar to hyperplastic colon polyp	Biopsy
	Simple or retention cyst	-	-	-		-	+/-	-	-	N/A					Degenerative epithelial changes because of obstruction	Biopsy
	Mucinous cystadenomas	+/-	+/-	+/-Diarrhea +/-Constipation	Generally asymptomatic Rupture may lead to Pseudomyxoma peritonei	+/-	+/-	If develop pseudomyxoma peritonei: Ascites Shifting dullness	-	CEA CA 19-9					Histologically benign Similar to colon adenomatous polyps or villous adnomas	Biopsy
	Mucinous cystadenocarcinomas	+/-	+/-	+/-Diarrhea +/-Constipation	+/-	+/-	-		-	CEA CA 19-9					Glandular invasion into the stoma Pseudomyxoma peritonei	Biopsy
Ovarian cancer		+/-	+/-	+/-Constipation	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
Colorectal cancer		+/-	+/-	+/-Diarrhea + Constipation	Weight loss Fatigue Low caliber of stools Nausea and vomiting Mucus in stools Rectal prolapse In Carcinoids : Weight loss Weakness Flushing Wheezing Shortness of breath Palpitations Leg edema	+	+/-	Colonoscopy Adenocarcinoma Polyps (villous, tubular, tubulo-villous) Ulcerating polyps Cancerouslesions Carcinoids Infiltrating, ulcerating or fungating lesions in the wall of colon	-/+(Carcinoid tumors)	Anemia Positive Fecal occult blood test High levels of CEA and CA 19-9	luminal narrowing, intestinal wall thickening,intussusception, bowel obstruction, hepatic metastases, intestinal perforation,enlarged lymph nodes	Tumor mass and the extension of tumor to other structures liver, lung and brain Metastasis	Generally not recommended: may evaluate liver metastasis or presence of fluid in abdominal cavity, but it is neither sensitive nor specific.	PET scan, Endoscopy, Colonoscopy, Barium enema	Depends on the tumor type.. You will find more information here	Biopsy
Pseudomyxoma peritonei		+	+	+/-Diarrhea +/-Constipation	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)